Pub Date : 2024-02-08DOI: 10.1007/s12039-023-02238-2
Gujju Narsimhulu, Viswanathan Baskar
The reaction of telluric acid with di-organotellurium di chloride (R2TeCl2) and tri-organoantimony dichloride (R3SbCl2) has been carried out in binary solvent using solvothermal synthesis method and isolated high-phase purity compounds. Single crystal X-ray diffraction studies revealed the formation of a novel mixed valent tellurium (VI) containing clusters TeVI[OTeIV(p-MeOC6H4)2Cl]6 (R = p-MeOC6H4) (1) and [Te(µ2-O5SbPh3)(OSbh3Cl)]2 (2). Cluster 1 has a central Te(VI) atom which is connected to six oxygen atoms octahedrally, further this oxygens bridging to six other tellurium atoms (IV). Cluster 2 is an octanuclear heterometallic cluster that is built up of a [Te (VI), Sb (V)] Te2Sb6 oxo-centered butterfly core. The products have been analyzed using single crystal X-ray diffractions, powder X-ray diffraction, and IR spectroscopic and analytical methods.
Graphical Abstract
A star-shaped mixed valent tellurium [(VI), (IV)] cluster TeVI[OTeIV(p-MeOC6H4)2Cl]6 (1) has been synthesized in binary solvent (Acetonitrile/DMF) medium. Cluster [Te(µ2-O5SbPh3)(OSbh3Cl)]2 (2) is an octanuclear heterometallic assembly built up of Te (VI) and Sb (V) ions, containing an oxo-centered butterfly core.
采用溶热合成法，在二元溶剂中进行了碲酸与二有机碲二氯化物（R2TeCl2）和三有机锑二氯化物（R3SbCl2）的反应，并分离出了高纯度化合物。单晶 X 射线衍射研究揭示了一种新型含混合价碲 (VI) 簇 TeVI[OTeIV(p-MeOC6H4)2Cl]6 （R = p-MeOC6H4）(1) 和 [Te(µ2-O5SbPh3)(OSbh3Cl)]2 (2)的形成。簇 1 具有一个中心 Te（VI）原子，该原子与六个氧原子呈八面体连接，氧原子再与其他六个碲原子（IV）桥接。簇 2 是由[Te（VI），Sb（V）] Te2Sb6 氧心蝶形核构成的八核异金属簇。利用单晶 X 射线衍射、粉末 X 射线衍射、红外光谱和分析方法对产物进行了分析。图解 摘要 在二元溶剂（乙腈/DMF）介质中合成了星形混合价碲[(VI), (IV)]簇 TeVI[OTeIV(p-MeOC6H4)2Cl]6 (1)。簇[Te(μ2-O5SbPh3)(OSbh3Cl)]2 (2) 是由 Te (VI) 离子和 Sb (V) 离子组成的八核异金属集合体，含有一个以氧化物为中心的蝶形核心。
{"title":"Star-shaped Te(VI)-Te(VI) complex and an octanuclear heterometallic Te2Sb6 oxo cluster","authors":"Gujju Narsimhulu, Viswanathan Baskar","doi":"10.1007/s12039-023-02238-2","DOIUrl":"10.1007/s12039-023-02238-2","url":null,"abstract":"<div><p>The reaction of telluric acid with di-organotellurium di chloride (R<sub>2</sub>TeCl<sub>2</sub>) and tri-organoantimony dichloride (R<sub>3</sub>SbCl<sub>2</sub>) has been carried out in binary solvent using solvothermal synthesis method and isolated high-phase purity compounds. Single crystal X-ray diffraction studies revealed the formation of a novel mixed valent tellurium (VI) containing clusters Te<sup>VI</sup>[OTe<sup>IV</sup>(<i>p</i>-MeOC<sub>6</sub>H<sub>4</sub>)<sub>2</sub>Cl]<sub>6</sub> (R = <i>p</i>-MeOC<sub>6</sub>H<sub>4</sub>) (<b>1</b>) and [Te(µ<sub>2</sub>-O<sub>5</sub>SbPh<sub>3</sub>)(OSbh<sub>3</sub>Cl)]<sub>2</sub> (<b>2</b>). Cluster <b>1</b> has a central Te(VI) atom which is connected to six oxygen atoms octahedrally, further this oxygens bridging to six other tellurium atoms (IV). Cluster <b>2</b> is an octanuclear heterometallic cluster that is built up of a [Te (VI), Sb (V)] Te<sub>2</sub>Sb<sub>6</sub> oxo-centered butterfly core. The products have been analyzed using single crystal X-ray diffractions, powder X-ray diffraction, and IR spectroscopic and analytical methods.</p><h3>Graphical Abstract</h3><p>A star-shaped mixed valent tellurium [(VI), (IV)] cluster Te<sup>VI</sup>[OTe<sup>IV</sup>(<i>p</i>-MeOC<sub>6</sub>H<sub>4</sub>)<sub>2</sub>Cl]<sub>6</sub> (<b>1</b>) has been synthesized in binary solvent (Acetonitrile/DMF) medium. Cluster [Te(µ<sub>2</sub>-O<sub>5</sub>SbPh<sub>3</sub>)(OSbh<sub>3</sub>Cl)]<sub>2</sub> (<b>2)</b> is an octanuclear heterometallic assembly built up of Te (VI) and Sb (V) ions, containing an oxo-centered butterfly core.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":616,"journal":{"name":"Journal of Chemical Sciences","volume":"136 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139771794","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-03DOI: 10.1007/s12039-023-02233-7
Dilip K Maity, Satrajit Adhikari, Susanta Mahapatra
{"title":"Interplay of structure and dynamics in reaction pathways, chemical reactivity and biological systems","authors":"Dilip K Maity, Satrajit Adhikari, Susanta Mahapatra","doi":"10.1007/s12039-023-02233-7","DOIUrl":"10.1007/s12039-023-02233-7","url":null,"abstract":"","PeriodicalId":616,"journal":{"name":"Journal of Chemical Sciences","volume":"136 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139683236","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A simple base, KOH-catalyzed cross-coupling of primary and secondary alcohols is reported in which the primary alcohols play the role of alkylation reagents. EPR and mechanistic studies confirmed the involvement of radical and ketone intermediates formed from primary and secondary alcohols, respectively, leading to the formation of β-alkylated secondary alcohols.
Graphical abstract
A simple base-catalyzed synthesis of higher secondary alcohols directly from the cross-coupling of primary and secondary alcohols is reported.
{"title":"KOH-catalyzed cross-coupling of primary and secondary alcohols: evidence for radical pathways","authors":"Amlan Subhadarshi Nayak, Shubham Jaiswal, Manas Kumar Sahu, Chidambaram Gunanathan","doi":"10.1007/s12039-023-02241-7","DOIUrl":"10.1007/s12039-023-02241-7","url":null,"abstract":"<div><p>A simple base, KOH-catalyzed cross-coupling of primary and secondary alcohols is reported in which the primary alcohols play the role of alkylation reagents. EPR and mechanistic studies confirmed the involvement of radical and ketone intermediates formed from primary and secondary alcohols, respectively, leading to the formation of <i>β</i>-alkylated secondary alcohols.</p><h3>Graphical abstract</h3><p>A simple base-catalyzed synthesis of higher secondary alcohols directly from the cross-coupling of primary and secondary alcohols is reported.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":616,"journal":{"name":"Journal of Chemical Sciences","volume":"136 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139500519","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-06DOI: 10.1007/s12039-023-02234-6
Damir A. Safin
A.Z. El-Sonbati et al., in their article “Synthesis, characterization of Schiff base metal complexes and their biological investigation” (Appl. Organometal. Chem. 2019, 33, e5048) reported on the synthesis of a new Schiff base named (E)-2-(((3-aminophenyl)imino)methyl)phenol (also known as N-salicylidene-m-phenylenediamine, HL), which was obtained through condensation reaction of m-phenylenediamine and salicylaldehyde in a 1:1 molar ratio. The reported Schiff base HL was involved in the complexation reaction with a series of metal cations named Cr(III), Mn(II), Fe(III), Co(II), Ni(II), Cu(II), Zn(II) and Cd(II). Although no crystal structures of either the parent ligand HL or its complexes with the mentioned metal cations were reported, the newly synthesized compounds were characterized by means of elemental analysis, IR-, UV-vis- and 1H NMR spectroscopy, mass-spectrometry, magnetic susceptibility, conductivity and thermal analyses. The antimicrobial activity of the discussed compounds, together with the molecular docking results, were also reported. Additionally, both the Schiff base HL and its metallocomplexes were thoroughly examined by quantum chemical calculations. Despite a plethora of different methods being applied to characterize the obtained compounds, herein, I argue that discussion of the results is doubtful. Furthermore, the results of quantum chemical calculations are dubious and must be reconsidered. Although numerous synthetic attempts failed in this work, the hypothetically possible Schiff base HL was revisited using quantum chemical calculations.
Graphical abstract
A.Z. El-Sonbati et al., in their article “Synthesis, characterization of Schiff base metal complexes and their biological investigation” (Appl. Organometal. Chem. 2019, 33, e5048) reported on a new Schiff base (E)-2-(((3-aminophenyl)imino)methyl)phenol (also known as N-salicylidene-m-phenylenediamine, HL) and its metallocomplexes. Herein, I argue that the discussion of the results is doubtful.
A.Z. El-Sonbati et al、在他们的文章 "Synthesis, characterization of Schiff base metal complexes and their biological investigation"（Appl. Organometal. Chem. 2019, 33, e5048）中报道了一种名为(E)-2-(((3-aminophenyl)imino)methyl)phenol（也称为 N-水杨醛-间苯二胺，HL）的新型席夫碱的合成，这种席夫碱是通过间苯二胺和水杨醛以 1:1 的摩尔比进行缩合反应得到的。所报告的希夫碱 HL 与一系列金属阳离子（Cr(III)、Mn(II)、Fe(III)、Co(II)、Ni(II)、Cu(II)、Zn(II) 和 Cd(II)）发生了络合反应。虽然母配体 HL 及其与上述金属阳离子的配合物的晶体结构未见报道，但新合成的化合物通过元素分析、红外光谱、紫外可见光谱和 1H NMR 光谱、质谱分析、磁感应强度、电导率和热分析进行了表征。同时还报告了所讨论化合物的抗菌活性以及分子对接结果。此外，还通过量子化学计算对希夫碱 HL 及其金属复合物进行了深入研究。尽管采用了大量不同的方法来表征所获得的化合物，但在此，我认为对结果的讨论是值得怀疑的。此外，量子化学计算的结果也值得怀疑，必须重新考虑。虽然在这项工作中多次合成尝试都失败了，但还是利用量子化学计算重新研究了假设可能的希夫碱 HL、在其文章 "Synthesis, characterization of Schiff base metal complexes and their biological investigation" (Appl. Organometal. Chem. 2019, 33, e5048)中报道了一种新的席夫碱(E)-2-((((3-氨基苯基)亚氨基)甲基)苯酚（又称N-水杨醛-间苯二胺，HL）及其金属络合物。在此，我认为对这些结果的讨论是有疑问的。
{"title":"Mono- versus bifunctionalized Schiff base as a condensation product of m-phenylenediamine and salicylaldehyde: experimental and computational studies","authors":"Damir A. Safin","doi":"10.1007/s12039-023-02234-6","DOIUrl":"10.1007/s12039-023-02234-6","url":null,"abstract":"<div><p>A.Z. El-Sonbati <i>et al.</i>, in their article “Synthesis, characterization of Schiff base metal complexes and their biological investigation” (<i>Appl. Organometal. Chem.</i> 2019, <i>33</i>, e5048) reported on the synthesis of a new Schiff base named (<i>E</i>)-2-(((3-aminophenyl)imino)methyl)phenol (also known as <i>N</i>-salicylidene-<i>m</i>-phenylenediamine, <b>HL</b>), which was obtained through condensation reaction of <i>m</i>-phenylenediamine and salicylaldehyde in a 1:1 molar ratio. The reported Schiff base <b>HL</b> was involved in the complexation reaction with a series of metal cations named Cr(III), Mn(II), Fe(III), Co(II), Ni(II), Cu(II), Zn(II) and Cd(II). Although no crystal structures of either the parent ligand <b>HL</b> or its complexes with the mentioned metal cations were reported, the newly synthesized compounds were characterized by means of elemental analysis, IR-, UV-vis- and <sup>1</sup>H NMR spectroscopy, mass-spectrometry, magnetic susceptibility, conductivity and thermal analyses. The antimicrobial activity of the discussed compounds, together with the molecular docking results, were also reported. Additionally, both the Schiff base <b>HL</b> and its metallocomplexes were thoroughly examined by quantum chemical calculations. Despite a plethora of different methods being applied to characterize the obtained compounds, herein, I argue that discussion of the results is doubtful. Furthermore, the results of quantum chemical calculations are dubious and must be reconsidered. Although numerous synthetic attempts failed in this work, the hypothetically possible Schiff base <b>HL</b> was revisited using quantum chemical calculations.</p><h3>Graphical abstract</h3><p>A.Z. El-Sonbati <i>et al.</i>, in their article “Synthesis, characterization of Schiff base metal complexes and their biological investigation” (<i>Appl. Organometal. Chem.</i> 2019, <i>33</i>, e5048) reported on a new Schiff base (<i>E</i>)-2-(((3-aminophenyl)imino)methyl)phenol (also known as <i>N</i>-salicylidene-<i>m</i>-phenylenediamine, <b>HL</b>) and its metallocomplexes. Herein, I argue that the discussion of the results is doubtful.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":616,"journal":{"name":"Journal of Chemical Sciences","volume":"136 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139375668","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-22DOI: 10.1007/s12039-023-02237-3
Athira Ravi, Ratri Biswas, Sarbani Das, Samar K. Das
A sole inorganic framework-material formulated as [Li(H2O)4][{CuI(H2O)1.5} {CuII(H2O)3}2{WVI12O36(OH)6}]·N2·H2S·3H2O (1), consisting of a hydroxylated polyoxometalate (POM) anion, [{WVI12O36(OH)6}]6− and a mixed-valent Cu(II)- and Cu(I)-aqua cationic complex species, [{CuI(H2O)1.5}{CuII(H2O)3}2]5+, has been utilized to explore its proton conductivity studies. The POM cluster anion is functionalized with six hydroxyl groups, meaning there are six WVI-OH groups per cluster unit. Compound 1, insoluble in water, can be described as an inorganic acid because its water suspension shows an acidic pH. The presence of these six hydroxyl groups per cluster unit having six labile protons has encouraged us to perform proton conductivity studies of this system. The highest proton conductivity of compound 1 is 1.72 ×10−2 S cm−1 at a temperature of 80 °C at 98% relative humidity (RH). Arrhenius plot has been constructed from the temperature-dependent proton conductivity values. The concerned Arrhenius plot has shown good linearity throughout the temperature range of 40 to 80 °C, revealing an activation energy of 0.41 eV. The compound has also shown remarkable stability in the conductivity value for 40 h.
Graphical Abstract
The proton conductivity studies of a framework-material [Li(H2O)4][{CuI(H2O)1.5} {CuII(H2O)3}2{WVI12O36(OH)6}]·N2·H2S·3H2O (1) have been performed. Compound 1 exhibits proton conductivity value of 1.72 ×10−2 S cm−1 at a temperature of 80 °C at 98% relative humidity. The concerned Arrhenius plot gives the activation energy value of 0.41 eV.
{"title":"Exploring Proton Conductivity Studies of a Copper-based Hydroxylated Polyoxometalate","authors":"Athira Ravi, Ratri Biswas, Sarbani Das, Samar K. Das","doi":"10.1007/s12039-023-02237-3","DOIUrl":"10.1007/s12039-023-02237-3","url":null,"abstract":"<div><p>A sole inorganic framework-material formulated as [Li(H<sub>2</sub>O)<sub>4</sub>][{Cu<sup>I</sup>(H<sub>2</sub>O)<sub>1.5</sub>} {Cu<sup>II</sup>(H<sub>2</sub>O)<sub>3</sub>}<sub>2</sub>{W<sup>VI</sup><sub>12</sub>O<sub>36</sub>(OH)<sub>6</sub>}]·N<sub>2</sub>·H<sub>2</sub>S·3H<sub>2</sub>O (<b>1</b>), consisting of a hydroxylated polyoxometalate (POM) anion, [{W<sup>VI</sup><sub>12</sub>O<sub>36</sub>(OH)<sub>6</sub>}]<sup>6−</sup> and a mixed-valent Cu(II)- and Cu(I)-aqua cationic complex species, [{Cu<sup>I</sup>(H<sub>2</sub>O)<sub>1.5</sub>}{Cu<sup>II</sup>(H<sub>2</sub>O)<sub>3</sub>}<sub>2</sub>]<sup>5+</sup>, has been utilized to explore its proton conductivity studies. The POM cluster anion is functionalized with six hydroxyl groups, meaning there are six W<sup>VI</sup>-OH groups per cluster unit. Compound <b>1</b>, insoluble in water, can be described as an inorganic acid because its water suspension shows an acidic pH. The presence of these six hydroxyl groups per cluster unit having six labile protons has encouraged us to perform proton conductivity studies of this system. The highest proton conductivity of compound <b>1</b> is 1.72 ×10<sup>−2</sup> S cm<sup>−1</sup> at a temperature of 80 °C at 98% relative humidity (RH). Arrhenius plot has been constructed from the temperature-dependent proton conductivity values. The concerned Arrhenius plot has shown good linearity throughout the temperature range of 40 to 80 °C, revealing an activation energy of 0.41 eV. The compound has also shown remarkable stability in the conductivity value for 40 h.</p><h3>Graphical Abstract</h3><p>The proton conductivity studies of a framework-material [Li(H<sub>2</sub>O)<sub>4</sub>][{Cu<sup>I</sup>(H<sub>2</sub>O)<sub>1.5</sub>} {Cu<sup>II</sup>(H<sub>2</sub>O)<sub>3</sub>}<sub>2</sub>{W<sup>VI</sup><sub>12</sub>O<sub>36</sub>(OH)<sub>6</sub>}]·N<sub>2</sub>·H<sub>2</sub>S·3H<sub>2</sub>O (<b>1</b>) have been performed. Compound <b>1</b> exhibits proton conductivity value of 1.72 ×10<sup>−2</sup> S cm<sup>−1</sup> at a temperature of 80 °C at 98% relative humidity. The concerned Arrhenius plot gives the activation energy value of 0.41 eV. \u0000</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":616,"journal":{"name":"Journal of Chemical Sciences","volume":"136 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138947645","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-22DOI: 10.1007/s12039-023-02231-9
Arundhati Sarkar, Arindam Mandal, Sayantanu Mandal, Surya Kanta Sen, Dipali Banerjee, Saibal Ganguly, Kajari Kargupta
A novel rGO (Reduced Graphene Oxide)-ZnO/WO3 nanohybrid has tremendous commercialization potential for photocatalytic hydrogen generation because of its cheap production costs, specific optical properties, remarkable stability and conductivity. It decreases charge recombination, improves photoelectronic transit, and broadens visible light absorption with rGO. This study developed a simple nano-casting procedure to include WO3 nanocuboids into rGO-ZnO nanorods formed by hydrothermal treatment with the appropriate amount of ZnO grafted on rGO. Improved photocatalytic activity has been discovered in rGO-ZnO nanocomposite with 1:3 ratios. The optimized powder rGO/ZnO (1:3) nanocomposite paired with WO3 exhibits the maximum photocatalytic hydrogen production activity (13.29 mmoles g−1h−1), which is approximately 1.27 times more active than the powder rGO/ZnO (1:3) nanocomposite (10.46 mmoles g−1 h−1). The contributions of rGO/ZnO (1:3) and integrated WO3 to photocatalytic hydrogen evolution enhancement have been fully investigated through experiment and characterization. The logical design and bottom-up synthesis of eco-friendly energy conversion materials with high performance and low-cost lead to commercialization and become the focal point of this effort.
Graphical abstract
Optimized rGO-ZnO (1:3)/ WO3 heterojunction: a robust photocatalyst with a low band gap exhibits a slow rate of electron-hole recombination and remarkable (13.29 mmole g−1 h−1) solar hydrogen production activity.
{"title":"High-Performance rGO-ZnO/WO3 heterojunction photocatalyst for solar green hydrogen generation","authors":"Arundhati Sarkar, Arindam Mandal, Sayantanu Mandal, Surya Kanta Sen, Dipali Banerjee, Saibal Ganguly, Kajari Kargupta","doi":"10.1007/s12039-023-02231-9","DOIUrl":"10.1007/s12039-023-02231-9","url":null,"abstract":"<div><p>A novel rGO (Reduced Graphene Oxide)-ZnO/WO<sub>3</sub> nanohybrid has tremendous commercialization potential for photocatalytic hydrogen generation because of its cheap production costs, specific optical properties, remarkable stability and conductivity. It decreases charge recombination, improves photoelectronic transit, and broadens visible light absorption with rGO. This study developed a simple nano-casting procedure to include WO<sub>3</sub> nanocuboids into rGO-ZnO nanorods formed by hydrothermal treatment with the appropriate amount of ZnO grafted on rGO. Improved photocatalytic activity has been discovered in rGO-ZnO nanocomposite with 1:3 ratios. The optimized powder rGO/ZnO (1:3) nanocomposite paired with WO<sub>3</sub> exhibits the maximum photocatalytic hydrogen production activity (13.29 mmoles g<sup>−1</sup>h<sup>−1</sup>), which is approximately 1.27 times more active than the powder rGO/ZnO (1:3) nanocomposite (10.46 mmoles g<sup>−1</sup> h<sup>−1</sup>). The contributions of rGO/ZnO (1:3) and integrated WO<sub>3</sub> to photocatalytic hydrogen evolution enhancement have been fully investigated through experiment and characterization. The logical design and bottom-up synthesis of eco-friendly energy conversion materials with high performance and low-cost lead to commercialization and become the focal point of this effort.</p><h3>Graphical abstract</h3><p>Optimized rGO-ZnO (1:3)/ WO<sub>3</sub> heterojunction: a robust photocatalyst with a low band gap exhibits a slow rate of electron-hole recombination and remarkable (13.29 mmole g<sup>−1</sup> h<sup>−1</sup>) solar hydrogen production activity.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":616,"journal":{"name":"Journal of Chemical Sciences","volume":"136 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138944066","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-11DOI: 10.1007/s12039-023-02235-5
Amir Hemmati, Mohammad Mahdavi, Hamid Emadi, Seyed Reza Nabavi
Thiocyanate functionalized carbon quantum dots (SCN-CDs) were produced via microwave synthesis using tree leaves called feijoa as a green material. The products were analyzed using spectroscopy and microscopy techniques, including high-resolution transmission electron microscopy (HR-TEM), spectrofluorometry, and X-ray photoelectron spectroscopy (XPS). SCN-CDs with blue emissivity were used to detect ascorbic acid (Ascor) in aquatic environments. The selectivity of SCN-CDs was reasonable, and the sensitivity was excellent. Cu(II) interaction with the SCN-CDs via static quenching mechanism leads to the SCN-CDs’ fluorescence (FL) being quenched, and Ascor’s reduction capacity recovers the SCN-CDs/Cu(II) FL, resulting in a switch-off-on sensor for Ascor detection. As a rapid and sensitive turn-on sensor, the limit of detection (LOD) of SCN-CQDs/Cu(II) for Ascor detection was 0.69 µM.
Graphical Abstract
Ascorbic acid (Ascor) is detected by thiocyanate functionalized carbon dots (SCN-CDs). SCN-CDs fluorescence was quenched by Cu(II) ions, resulting in static quenching, and Ascor recovered the fluorescence of SCN-CDs/Cu(II) by reducing Cu(II) ions to Cu(I) ions. Ascor was detected with a low detection limit (0.69 µM), good selectivity, and fast response.
{"title":"Green synthesis of thiocyanate functionalized carbon quantum dots as a fast and sensitive turn-on fluorescent probe for ascorbic acid detection","authors":"Amir Hemmati, Mohammad Mahdavi, Hamid Emadi, Seyed Reza Nabavi","doi":"10.1007/s12039-023-02235-5","DOIUrl":"10.1007/s12039-023-02235-5","url":null,"abstract":"<div><p>Thiocyanate functionalized carbon quantum dots (SCN-CDs) were produced via microwave synthesis using tree leaves called feijoa as a green material. The products were analyzed using spectroscopy and microscopy techniques, including high-resolution transmission electron microscopy (HR-TEM), spectrofluorometry, and X-ray photoelectron spectroscopy (XPS). SCN-CDs with blue emissivity were used to detect ascorbic acid (Ascor) in aquatic environments. The selectivity of SCN-CDs was reasonable, and the sensitivity was excellent. Cu(II) interaction with the SCN-CDs <i>via</i> static quenching mechanism leads to the SCN-CDs’ fluorescence (FL) being quenched, and Ascor’s reduction capacity recovers the SCN-CDs/Cu(II) FL, resulting in a switch-off-on sensor for Ascor detection. As a rapid and sensitive turn-on sensor, the limit of detection (LOD) of SCN-CQDs/Cu(II) for Ascor detection was 0.69 µM.</p><h3>Graphical Abstract</h3><p>Ascorbic acid (Ascor) is detected by thiocyanate functionalized carbon dots (SCN-CDs). SCN-CDs fluorescence was quenched by Cu(II) ions, resulting in static quenching, and Ascor recovered the fluorescence of SCN-CDs/Cu(II) by reducing Cu(II) ions to Cu(I) ions. Ascor was detected with a low detection limit (0.69 µM), good selectivity, and fast response.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":616,"journal":{"name":"Journal of Chemical Sciences","volume":"136 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138565978","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This work presents a coumarin-anthracene-based chemodosimeter L for the selective detection of Arginine (Arg) via hydrolysis of the imine bond of the Schiff base L. Significant changes in the emission and absorption spectra of L were observed during the detection of Arg. Chemodosimeter L displayed an impressive detection limit of 0.46 μM for Arg by the emission spectral titrations. A combination of UV-Vis, emission, and mass spectral studies, as well as excited-state lifetime measurements, and quantum yield calculations illustrated Arg-assisted dosimetry of L. The sensing of Arg by L was employed in cell imaging and for the colorimetric detection and paper test strip-based practical detection methods.
Graphical abstract
This work presents a chemodosimeter L based on a coumarin-anthracene platform for the selective detection of amino acid arginine.
{"title":"A coumarin-anthracene-based chemodosimeter for the selective detection of arginine","authors":"Devender Singh, Ibrahim Annan, Shivani Tyagi, Vedprakash Meena, Sweta Singh, Rajeev Gupta","doi":"10.1007/s12039-023-02215-9","DOIUrl":"10.1007/s12039-023-02215-9","url":null,"abstract":"<div><p>This work presents a coumarin-anthracene-based chemodosimeter <b>L</b> for the selective detection of Arginine (Arg) <i>via</i> hydrolysis of the imine bond of the Schiff base <b>L</b>. Significant changes in the emission and absorption spectra of <b>L</b> were observed during the detection of Arg. Chemodosimeter <b>L</b> displayed an impressive detection limit of 0.46 μM for Arg by the emission spectral titrations. A combination of UV-Vis, emission, and mass spectral studies, as well as excited-state lifetime measurements, and quantum yield calculations illustrated Arg-assisted dosimetry of <b>L</b>. The sensing of Arg by <b>L</b> was employed in cell imaging and for the colorimetric detection and paper test strip-based practical detection methods.</p><h3>Graphical abstract</h3><p>This work presents a chemodosimeter <b>L</b> based on a coumarin-anthracene platform for the selective detection of amino acid arginine.\u0000</p><figure><div><div><div><picture><source><img></source></picture></div></div></div></figure></div>","PeriodicalId":616,"journal":{"name":"Journal of Chemical Sciences","volume":"135 4","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"6551729","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-04DOI: 10.1007/s12039-023-02217-7
Behjat Pouramiri, Mohsen Rashidi
This research is aimed at synthesizing pyrimidine heterocycles that contain 1,3,4-thiadiazole ring moiety by microwave-assisted multi-component reactions. For this purpose, synthesizing of [1,3,4] thiadiazolo[3,2-a]pyrimidine-6-carboxylate derivatives was carried out in a single-step reaction using aromatic aldehydes, ethyl acetoacetate, and different derivatives of 1,3,4-thiadiazoles (with molar ratio of 1:2:1 respectively) in the presence of [Et3NH]+[HSO4]- ionic liquid, under solvent-free conditions.
Graphical abstract
This research, synthesis of [1,3,4] thiadiazolo[3,2-a]pyrimidine-6-carboxylate derivatives was carried out in a single-step reaction using aromatic aldehydes, ethyl acetoacetate and different derivatives of 1,3,4-thiadiazoles (with molar ratio of 1:2:1, respectively) in the presence of [Et3NH]+[HSO4]- ionic liquid under solvent-free microwave irradiation.
{"title":"Microwave-promoted multi-component and green synthesis of thiadiazolo[3,2-a]pyrimidines under solvent-free conditions","authors":"Behjat Pouramiri, Mohsen Rashidi","doi":"10.1007/s12039-023-02217-7","DOIUrl":"10.1007/s12039-023-02217-7","url":null,"abstract":"<div><p>This research is aimed at synthesizing pyrimidine heterocycles that contain 1,3,4-thiadiazole ring moiety by microwave-assisted multi-component reactions. For this purpose, synthesizing of [1,3,4] thiadiazolo[3,2-a]pyrimidine-6-carboxylate derivatives was carried out in a single-step reaction using aromatic aldehydes, ethyl acetoacetate, and different derivatives of 1,3,4-thiadiazoles (with molar ratio of 1:2:1 respectively) in the presence of [Et<sub>3</sub>NH]<sup>+</sup>[HSO<sub>4</sub>]<sup>-</sup> ionic liquid, under solvent-free conditions.</p><h3>Graphical abstract</h3><p>This research, synthesis of [1,3,4] thiadiazolo[3,2-a]pyrimidine-6-carboxylate derivatives was carried out in a single-step reaction using aromatic aldehydes, ethyl acetoacetate and different derivatives of 1,3,4-thiadiazoles (with molar ratio of 1:2:1, respectively) in the presence of [Et<sub>3</sub>NH]<sup>+</sup>[HSO<sub>4</sub>]<sup>-</sup> ionic liquid under solvent-free microwave irradiation.\u0000</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":616,"journal":{"name":"Journal of Chemical Sciences","volume":"135 3","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85242430","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-08-31DOI: 10.1007/s12039-023-02212-y
Jai Parkash, Sangeeta Saini
Different reaction pathways of CO oxidation at the surface of trimetallic nanoclusters, Au(5-x-y)AgxCuy of varying compositions with 2 ≤ x + y ≤ 4 (x, y > 0) are investigated. The starting point of all pathways is the surface reaction between adsorbed CO and O2via the Langmuir-Hinshelwood mechanism. The conventional reaction pathway leads to the formation of intermediate Au(5-x-y)AgxCuy.O* followed by a reaction with CO to release CO2. However, on these trimetallic clusters, the formation of the nanocluster-carbonate adduct is greatly facilitated, which is known to poison the catalytic surface because of its greater stability. Here, we propose a possible Eley-Rideal (ER) pathway leading to carbonate decomposition and catalytic surface regeneration. This ER-pathway involves interaction between nanocluster-carbonate adduct and CO in the gaseous state, forming Au(5-x-y)AgxCuy.O2COCO*, which decomposes to release CO2. The study suggests the best trimetallic clusters for CO oxidation are the ones where both reaction sites are Ag-sites.
Graphical abstract
Different reaction pathways of CO oxidation at the surface of trimetallic nanoclusters, Au(5-x-y)AgxCuy, are investigated. These include the conventional LH-LH pathway and a newer alternative LH-ER pathway. The proposed LH-ER pathway involves an interaction between nanocluster-carbonate adduct and CO(g), forming Au(5-x-y)AgxCuy.O2COCO*, which decomposes to release CO2.
2≤x + y≤4 (x, y >)三金属纳米团簇Au(5-x-y)AgxCuy表面CO氧化的不同反应途径;0)被调查。所有途径的起点是通过Langmuir-Hinshelwood机制吸附CO和O2之间的表面反应。常规反应途径生成中间产物Au(5-x-y)AgxCuy。O*随后与CO反应释放CO2。然而，在这些三金属簇上，纳米簇-碳酸盐加合物的形成非常容易，由于其更大的稳定性，已知会毒害催化表面。在这里，我们提出了一种可能的Eley-Rideal (ER)途径，导致碳酸盐分解和催化表面再生。这种er途径涉及纳米簇-碳酸盐加合物与气态CO相互作用，形成Au(5-x-y)AgxCuy。O2COCO*，分解释放二氧化碳。研究表明，CO氧化的最佳三金属簇是两个反应位点都是ag位点的簇。摘要研究了三金属纳米团簇Au(5-x-y)AgxCuy表面CO氧化的不同反应途径。这些途径包括传统的LH-LH途径和较新的LH-ER途径。提出的LH-ER途径涉及纳米簇-碳酸盐加合物与CO(g)相互作用，形成Au(5-x-y)AgxCuy。O2COCO*，分解释放二氧化碳。
{"title":"An alternative decomposition reaction pathway for CO oxidation at Au5-x-yAgxCuy (2 ≤ x + y ≤ 4) nanoclusters","authors":"Jai Parkash, Sangeeta Saini","doi":"10.1007/s12039-023-02212-y","DOIUrl":"10.1007/s12039-023-02212-y","url":null,"abstract":"<div><p>Different reaction pathways of CO oxidation at the surface of trimetallic nanoclusters, Au<sub>(5-x-y)</sub>Ag<sub>x</sub>Cu<sub>y</sub> of varying compositions with 2 ≤ x + y ≤ 4 (x, y > 0) are investigated. The starting point of all pathways is the surface reaction between adsorbed CO and O<sub>2</sub> <i>via</i> the Langmuir-Hinshelwood mechanism. The conventional reaction pathway leads to the formation of intermediate Au<sub>(5-x-y)</sub>Ag<sub>x</sub>Cu<sub>y.</sub>O* followed by a reaction with CO to release CO<sub>2</sub>. However, on these trimetallic clusters, the formation of the nanocluster-carbonate adduct is greatly facilitated, which is known to poison the catalytic surface because of its greater stability. Here, we propose a possible Eley-Rideal (ER) pathway leading to carbonate decomposition and catalytic surface regeneration. This ER-pathway involves interaction between nanocluster-carbonate adduct and CO in the gaseous state, forming Au<sub>(5-x-y)</sub>Ag<sub>x</sub>Cu<sub>y.</sub>O<sub>2</sub>COCO*, which decomposes to release CO<sub>2</sub>. The study suggests the best trimetallic clusters for CO oxidation are the ones where both reaction sites are Ag-sites.</p><h3>Graphical abstract</h3><p>Different reaction pathways of CO oxidation at the surface of trimetallic nanoclusters, Au<sub>(5-x-y)</sub>Ag<sub>x</sub>Cu<sub>y</sub>, are investigated. These include the conventional LH-LH pathway and a newer alternative LH-ER pathway. The proposed LH-ER pathway involves an interaction between nanocluster-carbonate adduct and CO(g), forming Au<sub>(5-x-y)</sub>Ag<sub>x</sub>Cu<sub>y</sub>.O<sub>2</sub>COCO*, which decomposes to release CO<sub>2</sub>.</p>\u0000 <div><figure><div><div><picture><source><img></source></picture></div></div></figure></div>\u0000 </div>","PeriodicalId":616,"journal":{"name":"Journal of Chemical Sciences","volume":"135 3","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77303513","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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