Pub Date : 2024-12-04DOI: 10.1007/s12039-024-02331-0
Aman Pandey, G Naresh Patwari
Conformational space of small molecules can be exploited to deploy the hierarchical nature of intermolecular interactions, such as hydrogen bonding and π-stacking in the crystal structures. Modulation of conformational space was achieved by varying the alkyl chain length in N′-phenylalkylsquaramates and bis-N,N′-diphenylalkylsquaramides, which were synthesized by condensation of dimethyl squarate with the corresponding phenyl alkylamines. In the crystal structures of these compounds, even though the catemeric N–H···O hydrogen bonding is the primary interaction and hierarchy in the secondary interactions consisting of π-stacking and H···H bonding leads to a large variation in molecular structures in the solid state.
Graphical abstract
Conformational variation in the alkyl chain linker connected to central squaramide unit is contingent to the variation in partner chain length.
{"title":"Role of alkyl chain linker in the conformational preferences of N′-phenylalkylsquaramates and bis-N,N′-diphenylalkylsquaramides","authors":"Aman Pandey, G Naresh Patwari","doi":"10.1007/s12039-024-02331-0","DOIUrl":"10.1007/s12039-024-02331-0","url":null,"abstract":"<div><p>Conformational space of small molecules can be exploited to deploy the hierarchical nature of intermolecular interactions, such as hydrogen bonding and π-stacking in the crystal structures. Modulation of conformational space was achieved by varying the alkyl chain length in <i>N′</i>-phenylalkylsquaramates and bis-<i>N,N′</i>-diphenylalkylsquaramides, which were synthesized by condensation of dimethyl squarate with the corresponding phenyl alkylamines. In the crystal structures of these compounds, even though the catemeric N–H···O hydrogen bonding is the primary interaction and hierarchy in the secondary interactions consisting of π-stacking and H···H bonding leads to a large variation in molecular structures in the solid state.</p><h3>Graphical abstract</h3><p>Conformational variation in the alkyl chain linker connected to central squaramide unit is contingent to the variation in partner chain length.\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 4","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142761699","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 : 2024-12-04DOI: 10.1007/s12039-024-02316-z
Rajinder Kaur, Ramesh Kataria, Surbhi Sharma
The emergence of aggregation-induced emission luminogens (AIEgens) has significantly stimulated the development of luminescent supramolecular materials because of their strong emissions in the aggregated state. With this inspiration, pyrene tethered Schiff base molecule, namely (Z)-1-(2,4-dinitrophenyl)-2-(pyren-1-ylmethylene), hydrazine was designed and successfully synthesized and well characterized by using proton (1H NMR), Fourier–transform infrared (FT-IR), and electron ionization mass spectrometry (EI-MS). UV-visible absorption and emission studies have been employed to elucidate self-assembled and aggregation properties. It is shown that monomers of synthesized compounds can exhibit emission driven by assembly by forming an H-aggregate, which corresponds to its blue shift tuning to the visible region associated with the extended π-conjugation. Furthermore, to have a more profound understanding of the supramolecular assembly, TEM and confocal microscopy were utilized to verify the aggregate morphology. In both investigations, monomer aggregation into a vesicular structure with monodispersed PDI is preferred.
Graphical abstract
Pyrene tethered Schiff base molecule, namely (Z)-1-(2,4-dinitrophenyl)-2-(pyren-1-ylmethylene), hydrazine was designed and successfully synthesized. Monomer 1 demonstrating aggregation-induced emission upon increasing the gradual amount of H2O in DMF solution of compound 1 (DMF/H2O, 30/70 (v/v). Pictorial representation is also pasted along with TEM and confocal results of aggregate or supramolecular structures of synthesised compound.
{"title":"Pyrene-tethered self-assembled supramolecular system demonstrating vesicular structures and aggregation-induced emission: synthesis, assembled studies and morphology","authors":"Rajinder Kaur, Ramesh Kataria, Surbhi Sharma","doi":"10.1007/s12039-024-02316-z","DOIUrl":"10.1007/s12039-024-02316-z","url":null,"abstract":"<div><p>The emergence of aggregation-induced emission luminogens (AIEgens) has significantly stimulated the development of luminescent supramolecular materials because of their strong emissions in the aggregated state. With this inspiration, pyrene tethered Schiff base molecule, namely (Z)-1-(2,4-dinitrophenyl)-2-(pyren-1-ylmethylene), hydrazine was designed and successfully synthesized and well characterized by using proton (<sup>1</sup>H NMR), Fourier–transform infrared (FT-IR), and electron ionization mass spectrometry (EI-MS). UV-visible absorption and emission studies have been employed to elucidate self-assembled and aggregation properties. It is shown that monomers of synthesized compounds can exhibit emission driven by assembly by forming an H-aggregate, which corresponds to its blue shift tuning to the visible region associated with the extended <i>π</i>-conjugation. Furthermore, to have a more profound understanding of the supramolecular assembly, TEM and confocal microscopy were utilized to verify the aggregate morphology. In both investigations, monomer aggregation into a vesicular structure with monodispersed PDI is preferred.</p><h3>Graphical abstract</h3><p>Pyrene tethered Schiff base molecule, namely (Z)-1-(2,4-dinitrophenyl)-2-(pyren-1-ylmethylene), hydrazine was designed and successfully synthesized. Monomer <b>1</b> demonstrating aggregation-induced emission upon increasing the gradual amount of H<sub>2</sub>O in DMF solution of compound 1 (DMF/H<sub>2</sub>O, 30/70 (v/v). Pictorial representation is also pasted along with TEM and confocal results of aggregate or supramolecular structures of synthesised compound.</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 4","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142761701","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 : 2024-12-04DOI: 10.1007/s12039-024-02332-z
Xue Wang, Ji Li, Jia-Yan Liu, Dong-Sheng Chen
An acid-catalyzed three-component reaction of arylglyoxals, quinoxalin-6-amine and 4-hydroxycoumarin is described, leading to the synthesis of new functionalized 7H-pyrrolo[3,2-f]quinoxaline derivatives with good yields. It has high synthetic efficiency and operational simplicity, and only water was generated as a byproduct.
Graphical abstract
A new procedure for the synthesis of pyrrolo[3,2-f]quinoxaline derivatives.
{"title":"A new synthesis of 7H-pyrrolo[3,2-f]quinoxaline derivatives by a one-pot, three-component reaction","authors":"Xue Wang, Ji Li, Jia-Yan Liu, Dong-Sheng Chen","doi":"10.1007/s12039-024-02332-z","DOIUrl":"10.1007/s12039-024-02332-z","url":null,"abstract":"<div><p>An acid-catalyzed three-component reaction of arylglyoxals, quinoxalin-6-amine and 4-hydroxycoumarin is described, leading to the synthesis of new functionalized 7<i>H</i>-pyrrolo[3,2-<i>f</i>]quinoxaline derivatives with good yields. It has high synthetic efficiency and operational simplicity, and only water was generated as a byproduct.</p><h3>Graphical abstract</h3><p>A new procedure for the synthesis of pyrrolo[3,2-<i>f</i>]quinoxaline derivatives.\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 4","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142761700","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 : 2024-11-29DOI: 10.1007/s12039-024-02307-0
Reena Ravindran, Minitha R, Shiji Fazil, A. Sarau Devi
New ruthenium(II) complex containing cyanide anions has been isolated from the hydrazonochromandione ligand 3-(2-(4-chlorophenyl)hydrazono)chroman-2,4-dione in the presence of acetonitrile along with triethylamine from Ru(III) salt. This method is a one-pot synthetic approach for preparing dicyano Ru(II) complex. Using physicochemical and spectral techniques, the synthesized compound [Ru(CN)2L2]·2Et3N+H was structurally described. The monoanionic bidentate character of the hydrazone ligand and coordination through carbonyl oxygen and deprotonated hydrazonochroman-2,4-dione nitrogen atom were revealed by single crystal X-ray diffraction investigation of the Ru(II) complex. Ru(II) complex is a member of the P21/n space group and monoclinic system. Ru(II) chelate rings were stabilized by intermolecular hydrogen bonds and π–π stacking interactions between ligands and triethylammonium molecules. A single phase with rod-like morphologies is imaged by SEM. The quasi-reversible single electron transfer property is exhibited by the Ru(II) complex.
{"title":"Formation of dicyano ruthenium(II) complex mediated by triethylamine via deprotonation of hydrazonochroman-2,4-dione","authors":"Reena Ravindran, Minitha R, Shiji Fazil, A. Sarau Devi","doi":"10.1007/s12039-024-02307-0","DOIUrl":"10.1007/s12039-024-02307-0","url":null,"abstract":"<p>New ruthenium(II) complex containing cyanide anions has been isolated from the hydrazonochromandione ligand 3-(2-(4-chlorophenyl)hydrazono)chroman-2,4-dione in the presence of acetonitrile along with triethylamine from Ru(III) salt. This method is a one-pot synthetic approach for preparing dicyano Ru(II) complex. Using physicochemical and spectral techniques, the synthesized compound [Ru(CN)<sub>2</sub>L<sub>2</sub>]·2Et<sub>3</sub>N<sup>+</sup>H was structurally described. The monoanionic bidentate character of the hydrazone ligand and coordination through carbonyl oxygen and deprotonated hydrazonochroman-2,4-dione nitrogen atom were revealed by single crystal X-ray diffraction investigation of the Ru(II) complex. Ru(II) complex is a member of the P21/n space group and monoclinic system. Ru(II) chelate rings were stabilized by intermolecular hydrogen bonds and <i>π</i>–<i>π</i> stacking interactions between ligands and triethylammonium molecules. A single phase with rod-like morphologies is imaged by SEM. The quasi-reversible single electron transfer property is exhibited by the Ru(II) complex.</p>","PeriodicalId":616,"journal":{"name":"Journal of Chemical Sciences","volume":"136 4","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142737240","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 : 2024-11-29DOI: 10.1007/s12039-024-02323-0
Ho Van Minh Hai, Van Cuong Nguyen, The Ky Vo
Herein, we report on facile fabricating sensors based on Ag/α-Fe2O3 nanocubes harvesting by one-step pyrolyzing Prussian blue (PSB) template anchored AgNO3 at different temperatures (300~500°C) and exploiting them for electrochemical sensing of methylparaben (MP). The Ag/Fe2O3 nanocubes had crystallite sizes ranging from 300~400 nm and incorporated reduced Ag nanoparticles (AgNPs) ranging from 10.5~15.3 nm. Notably, the harvested Ag/Fe2O3 composites were constructed hetero-interfacial Ag–Fe2O3 structures inside the porous α-Fe2O3 cubes with interconnected pore matrix resulting from the thermal conversion of PSB. The carbon glass electrode (GCE) coated with an Ag/Fe2O3 sensor prepared at 400°C showed the highest oxidation peak at 0.84 V towards MP. In addition, the Ag/α-Fe2O3@GCE interface achieved an excellent detection of MP with a low LOD of 0.14 µM and a linear response range of 10~38 µM. The sensor also depicted good selectivity and stability during 10 days, demonstrating a suitable sensor for detecting and analyzing MP. This study provides a facile strategy for constructing a porous Ag/Fe2O3 heterostructural composite as an efficient electrochemical sensing material.
Graphical abstract
Sensors based on Ag/α-Fe2O3 nanocube harvesting by one-step pyrolyzing Prussian blue (PSB) template anchored AgNO3 and exploited for the electrochemical sensing of methylparaben. The results suggest that Ag/α-Fe2O3 nanocube crystals comprise heterointerfaces and interconnected pores. The Ag/α-Fe2O3@GCE interface exhibited excellent detection of methylparaben, good stability, and selectivity.
{"title":"AgNO3-anchored Prussian blue-derived porous Ag/α-Fe2O3 heterostructure with enhanced electrochemical sensing performance towards methylparaben","authors":"Ho Van Minh Hai, Van Cuong Nguyen, The Ky Vo","doi":"10.1007/s12039-024-02323-0","DOIUrl":"10.1007/s12039-024-02323-0","url":null,"abstract":"<div><p>Herein, we report on facile fabricating sensors based on Ag/<i>α</i>-Fe<sub>2</sub>O<sub>3</sub> nanocubes harvesting by one-step pyrolyzing Prussian blue (PSB) template anchored AgNO<sub>3</sub> at different temperatures (300~500°C) and exploiting them for electrochemical sensing of methylparaben (MP). The Ag/Fe<sub>2</sub>O<sub>3</sub> nanocubes had crystallite sizes ranging from 300~400 nm and incorporated reduced Ag nanoparticles (AgNPs) ranging from 10.5~15.3 nm. Notably, the harvested Ag/Fe<sub>2</sub>O<sub>3</sub> composites were constructed hetero-interfacial Ag–Fe<sub>2</sub>O<sub>3</sub> structures inside the porous <i>α</i>-Fe<sub>2</sub>O<sub>3</sub> cubes with interconnected pore matrix resulting from the thermal conversion of PSB. The carbon glass electrode (GCE) coated with an Ag/Fe<sub>2</sub>O<sub>3</sub> sensor prepared at 400°C showed the highest oxidation peak at 0.84 V towards MP. In addition, the Ag/<i>α</i>-Fe<sub>2</sub>O<sub>3</sub>@GCE interface achieved an excellent detection of MP with a low LOD of 0.14<i> µ</i>M and a linear response range of 10~38 <i>µ</i>M. The sensor also depicted good selectivity and stability during 10 days, demonstrating a suitable sensor for detecting and analyzing MP. This study provides a facile strategy for constructing a porous Ag/Fe<sub>2</sub>O<sub>3</sub> heterostructural composite as an efficient electrochemical sensing material.</p><h3>Graphical abstract</h3><p>Sensors based on Ag/<i>α</i>-Fe<sub>2</sub>O<sub>3</sub> nanocube harvesting by one-step pyrolyzing Prussian blue (PSB) template anchored AgNO<sub>3</sub> and exploited for the electrochemical sensing of methylparaben. The results suggest that Ag/<i>α</i>-Fe<sub>2</sub>O<sub>3</sub> nanocube crystals comprise heterointerfaces and interconnected pores. The Ag/<i>α</i>-Fe<sub>2</sub>O<sub>3</sub>@GCE interface exhibited excellent detection of methylparaben, good stability, and selectivity.\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 4","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142737239","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}
Diacetyl (C4H6O2) is an important organic diketone that is widely used as flavoring agent and food additive. It is toxic when inhaled or exposed to high concentrations and may lead to chronic respiratory disease and neurodegenerative disorders. But, a viable optical detection method for rapid and quantitative estimation of diacetyl molecules in gas phase does not currently exist. Here, we report the design and development of a simple, compact and cost-effective robust optical technique exploiting incoherent broadband cavity-enhanced absorption spectroscopy (IBBCEAS) technique for high-sensitive selective detection and quantitative estimation of gas-phase diacetyl levels in real-time using a visible light emitting diode (LED) operating at 450 nm. The IBBCEAS method demonstrates an effective optical-path length of 4.5 km within an optical cavity (Finesse ~15706) composed of two high-reflective mirrors. A typical detection limit of ~190 parts-per-billion (ppb) for diacetyl was achieved with an optimum acquisition time of ~4 s at an optimal cavity pressure of 100 Torr. LED-based diacetyl sensor system was optimized, calibrated and demonstrated for trace detection of gaseous diacetyl at the ppb levels in various food products and liquor samples as a few representative applications, thus paving the way for development of future optical monitors.
Graphical abstract
This work represents the development of a LED-based optical setup for the detection of diacetyl molecule in gas phase.
二乙酰（C4H6O2）是一种重要的有机二酮，被广泛用作调味剂和食品添加剂。吸入或暴露于高浓度时会中毒，可能导致慢性呼吸道疾病和神经退行性疾病。但是，目前还没有一种可行的光学检测方法来快速、定量地估计气相中的双乙酰分子。在此，我们报告了利用非相干宽带空腔增强吸收光谱（IBBCEAS）技术设计和开发的一种简单、紧凑、高性价比的稳健光学技术，该技术利用工作波长为 450 纳米的可见光发光二极管（LED）对气相中的双乙酰水平进行高灵敏度的选择性检测和实时定量估算。IBBCEAS 方法在由两个高反射镜组成的光腔（Finesse ~15706）内的有效光路长度为 4.5 千米。在最佳腔压为 100 托时，最佳采集时间为 4 秒，双乙酰的典型检测限为十亿分之 190 (ppb)。对基于 LED 的双乙酰传感器系统进行了优化、校准和演示，可用于痕量检测各种食品和酒类样品中ppb级的气态双乙酰，从而为开发未来的光学监测器铺平了道路。 图文摘要 这项工作展示了基于 LED 的光学装置的开发，用于检测气相中的双乙酰分子。
{"title":"LED-based broadband cavity-enhanced spectrometer for high-sensitive optical detection of diacetyl in gas phase","authors":"Ardhendu Pal, Koushik Mondal, Soumen Mandal, Soumyadipta Chakraborty, Indrayani Patra, Manik Pradhan","doi":"10.1007/s12039-024-02324-z","DOIUrl":"10.1007/s12039-024-02324-z","url":null,"abstract":"<div><p>Diacetyl (C<sub>4</sub>H<sub>6</sub>O<sub>2</sub>) is an important organic diketone that is widely used as flavoring agent and food additive. It is toxic when inhaled or exposed to high concentrations and may lead to chronic respiratory disease and neurodegenerative disorders. But, a viable optical detection method for rapid and quantitative estimation of diacetyl molecules in gas phase does not currently exist. Here, we report the design and development of a simple, compact and cost-effective robust optical technique exploiting incoherent broadband cavity-enhanced absorption spectroscopy (IBBCEAS) technique for high-sensitive selective detection and quantitative estimation of gas-phase diacetyl levels in real-time using a visible light emitting diode (LED) operating at 450 nm. The IBBCEAS method demonstrates an effective optical-path length of 4.5 km within an optical cavity (Finesse ~15706) composed of two high-reflective mirrors. A typical detection limit of ~190 parts-per-billion (ppb) for diacetyl was achieved with an optimum acquisition time of ~4 s at an optimal cavity pressure of 100 Torr. LED-based diacetyl sensor system was optimized, calibrated and demonstrated for trace detection of gaseous diacetyl at the ppb levels in various food products and liquor samples as a few representative applications, thus paving the way for development of future optical monitors.</p><h3>Graphical abstract</h3><p>This work represents the development of a LED-based optical setup for the detection of diacetyl molecule in gas phase.</p>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":616,"journal":{"name":"Journal of Chemical Sciences","volume":"136 4","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142736962","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 new copper (II) coordination polymer [{Cu(TMDP)(2,3-pydc)}.2H2O]n(A) has been synthesized successfully by solvolysis method using ligands 4,4′-trimethylenedipyridine (TMDP) and 2,3-pyridinedicarboxylic acid (2,3-pydc). The structure of the synthesised coordination polymer is confirmed by the single crystal X-ray diffraction study and also supported by CHN analysis. FTIR, UV-visible spectroscopy, thermogravimetric analysis (TGA) and powder XRD study are used to characterize A. The polymer in aqueous solution is applied as effective catalyst for reductive degradation of methyl orange (MO) and Congo red (CR) dyes with reducing agent sodium borohydride (NaBH4) under dark. The detail study of the catalytic reaction and its kinetic study reveals 97% and 76% degradation of MO and CR with rate constants of 0.061 min−1 and 0.005 min−1, respectively. This is the first example where a coordination polymer has been used for reductive degradation of dyes under dark condition.
Graphical abstract
A newly synthesized copper (II) coordination polymer [{Cu(TMDP)(2,3-pydc)}.2H2O]n (A) has been developed and studied by different analytical methods. The polymer (A) is then used as catalyst for degradation of anionic (MO and CR) dyes.
{"title":"Synthesis and characterization of a new coordination polymer of copper (II): Catalytic application for reductive degradation of dyes under dark","authors":"Aieshri Swargiary, Tanmoy Kumar Ghosh, Arunendu Mondal","doi":"10.1007/s12039-024-02313-2","DOIUrl":"10.1007/s12039-024-02313-2","url":null,"abstract":"<div><p>A new copper (II) coordination polymer [{Cu(TMDP)(2,3-pydc)}.2H<sub>2</sub>O]<sub><i>n</i></sub> <b>(A)</b> has been synthesized successfully by solvolysis method using ligands 4,4′-trimethylenedipyridine (TMDP) and 2,3-pyridinedicarboxylic acid (2,3-pydc). The structure of the synthesised coordination polymer is confirmed by the single crystal X-ray diffraction study and also supported by CHN analysis. FTIR, UV-visible spectroscopy, thermogravimetric analysis (TGA) and powder XRD study are used to characterize <b>A</b>. The polymer in aqueous solution is applied as effective catalyst for reductive degradation of methyl orange (MO) and Congo red (CR) dyes with reducing agent sodium borohydride (NaBH<sub>4</sub>) under dark. The detail study of the catalytic reaction and its kinetic study reveals 97% and 76% degradation of MO and CR with rate constants of 0.061 min<sup>−1</sup> and 0.005 min<sup>−1</sup>, respectively. This is the first example where a coordination polymer has been used for reductive degradation of dyes under dark condition.</p><h3>Graphical abstract</h3><p>A newly synthesized copper (II) coordination polymer [{Cu(TMDP)(2,3-pydc)}.2H<sub>2</sub>O]<sub>n</sub> (<b>A</b>) has been developed and studied by different analytical methods. The polymer (<b>A</b>) is then used as catalyst for degradation of anionic (MO and CR) dyes.\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 4","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142714574","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 : 2024-11-26DOI: 10.1007/s12039-024-02318-x
Harun Khan, Aiswarya Kesh, Kothandaraman Ramanujam, Akhila Kumar Sahu
Nafion has gained widespread recognition as the predominant membrane due to its good proton conductivity, robust chemical resistance, and commendable mechanical stability. However, due to its well-developed water channels, it has poor barrier properties toward vanadium ions. Herein, to reduce vanadium ions permeability across the membranes without compromising the proton conductivity, graphene nanofiber (Herringbone type, GNF-H) as a filler has been incorporated into the Nafion matrix to fabricate the composite membrane. The membranes were subjected to physiochemical characterization, vanadium ion permeability, electrochemical impedance spectroscopy, and galvanostatic charge-discharge at different current densities. Vanadium permeability has significantly reduced in the 0.75% and 1% GNF-H composite membranes. Composite membranes (0.5%, 0.75%, and 1% GNF-H) showed a capacity of ~18.2, ~18.9, and ~16.8 Ah L−1 at 100 mA cm−2, respectively, whereas NafionTM 117 exhibited only ~16.3 Ah L−1 capacity at the same current density. The peak power of the cells consisted of 0.5, 0.75, and 1% GNF-H composite membrane and NafionTM 117 is ~538, ~507, ~465 and 388 mW cm−2, respectively. The present study concludes that applying Nafion/GNF-H in the VRFB system can be a promising strategy to reduce the vanadium ion permeation, cost-cutting and improve the VRFB performance.
GNF-H serves as a physical barrier to vanadium ion movement within the Nafion matrix, potentially lengthening the transport path of vanadium ions through the membrane. This reduces crossover and enhances membrane selectivity while not impeding proton transport, thereby enhancing the performance of VRFB.
{"title":"Functionalized graphene nanofiber-based low-cost composite membrane for vanadium redox flow battery applications","authors":"Harun Khan, Aiswarya Kesh, Kothandaraman Ramanujam, Akhila Kumar Sahu","doi":"10.1007/s12039-024-02318-x","DOIUrl":"10.1007/s12039-024-02318-x","url":null,"abstract":"<p>Nafion has gained widespread recognition as the predominant membrane due to its good proton conductivity, robust chemical resistance, and commendable mechanical stability. However, due to its well-developed water channels, it has poor barrier properties toward vanadium ions. Herein, to reduce vanadium ions permeability across the membranes without compromising the proton conductivity, graphene nanofiber (Herringbone type, GNF-H) as a filler has been incorporated into the Nafion matrix to fabricate the composite membrane. The membranes were subjected to physiochemical characterization, vanadium ion permeability, electrochemical impedance spectroscopy, and galvanostatic charge-discharge at different current densities. Vanadium permeability has significantly reduced in the 0.75% and 1% GNF-H composite membranes. Composite membranes (0.5%, 0.75%, and 1% GNF-H) showed a capacity of ~18.2, ~18.9, and ~16.8 Ah L<sup>−1</sup> at 100 mA cm<sup>−2</sup>, respectively, whereas Nafion<sup>TM</sup> 117 exhibited only ~16.3 Ah L<sup>−1</sup> capacity at the same current density. The peak power of the cells consisted of 0.5, 0.75, and 1% GNF-H composite membrane and Nafion<sup>TM</sup> 117 is ~538, ~507, ~465 and 388 mW cm<sup>−2</sup>, respectively. The present study concludes that applying Nafion/GNF-H in the VRFB system can be a promising strategy to reduce the vanadium ion permeation, cost-cutting and improve the VRFB performance.</p><p>GNF-H serves as a physical barrier to vanadium ion movement within the Nafion matrix, potentially lengthening the transport path of vanadium ions through the membrane. This reduces crossover and enhances membrane selectivity while not impeding proton transport, thereby enhancing the performance of VRFB.</p>","PeriodicalId":616,"journal":{"name":"Journal of Chemical Sciences","volume":"136 4","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142714573","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 : 2024-11-11DOI: 10.1007/s12039-024-02322-1
E A Mukhanova, P D Kuznetsova, P V Medvedev, C Y Cárdenas Rodriguez, E R Kolomenskaya, A N Bulgakov, S V Chapek, O E Polozhentsev, A V Soldatov
Nowadays, microfluidic synthesis has many advantages over bulk synthesis. By controlling the flow into the microfluidic chip, we can synthesize nanoparticles with defined and precise characteristics. A continuous microfluidics synthesis of CaWO4 was conducted to obtain nanoparticles with a Scheelite structure approximately 10 nm in diameter. The CaWO4 nanoparticles were characterized using elemental composition, chemical structure, particle size distribution, and morphology. Calcium tungstate and its derivatives are well known for their optical properties and have great potential for medical applications. The small diameter of nanoparticles allows the synthesis of composites on their basic for theranostics in cancer treatment. Our work indicates the potential opportunity of a continuous microfluidics technique for the rapid fabrication of Scheelite-type tungstate.
Graphical abstract
Microfluidic synthesis of CaWO4 nanoparticles with a Scheelite structure using a continuous process yielding 10 nm particles. Characterization includes elemental composition, structure, and morphology. This substance has potential applications in photodynamic therapy because of its optical properties.
{"title":"Microfluidic synthesis of calcium tungstate CaWO4","authors":"E A Mukhanova, P D Kuznetsova, P V Medvedev, C Y Cárdenas Rodriguez, E R Kolomenskaya, A N Bulgakov, S V Chapek, O E Polozhentsev, A V Soldatov","doi":"10.1007/s12039-024-02322-1","DOIUrl":"10.1007/s12039-024-02322-1","url":null,"abstract":"<div><p>Nowadays, microfluidic synthesis has many advantages over bulk synthesis. By controlling the flow into the microfluidic chip, we can synthesize nanoparticles with defined and precise characteristics. A continuous microfluidics synthesis of CaWO<sub>4</sub> was conducted to obtain nanoparticles with a Scheelite structure approximately 10 nm in diameter. The CaWO<sub>4</sub> nanoparticles were characterized using elemental composition, chemical structure, particle size distribution, and morphology. Calcium tungstate and its derivatives are well known for their optical properties and have great potential for medical applications. The small diameter of nanoparticles allows the synthesis of composites on their basic for theranostics in cancer treatment. Our work indicates the potential opportunity of a continuous microfluidics technique for the rapid fabrication of Scheelite-type tungstate.</p><h3>Graphical abstract</h3><p>Microfluidic synthesis of CaWO<sub>4</sub> nanoparticles with a Scheelite structure using a continuous process yielding 10 nm particles. Characterization includes elemental composition, structure, and morphology. This substance has potential applications in photodynamic therapy because of its optical properties.\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 4","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142598887","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 : 2024-11-11DOI: 10.1007/s12039-024-02311-4
Xiao-Li Qin, Xue-Qing Ding, Yu-Qin Li, Yi-Hao Yu, Fan Xu, Zhou Rong
A method for synthesizing 3-substituted isocoumarins under copper catalysis involves the cyclization reaction of o-bromobenzoic acid and alkynes in DMSO, with the assistance of K2CO3 at 100 °C. It exhibits a wide range of substrate compatibility and excellent tolerance towards diverse functional groups.
Graphical abstract
A method for synthesizing 3-substituted isocoumarins under copper catalysis involves the cyclization reaction of o-bromobenzoic acid and alkynes in DMSO, with the assistance of K2CO3 at 100 °C. This reaction demonstrates a synthesis yield of 8–81% for 3-substituted isocoumarins.
{"title":"Copper-catalyzed synthesis of 3-substituted isocoumarins from 2-halogenation benzoic acid and alkynes","authors":"Xiao-Li Qin, Xue-Qing Ding, Yu-Qin Li, Yi-Hao Yu, Fan Xu, Zhou Rong","doi":"10.1007/s12039-024-02311-4","DOIUrl":"10.1007/s12039-024-02311-4","url":null,"abstract":"<div><p>A method for synthesizing 3-substituted isocoumarins under copper catalysis involves the cyclization reaction of <i>o</i>-bromobenzoic acid and alkynes in DMSO, with the assistance of K<sub>2</sub>CO<sub>3</sub> at 100 °C. It exhibits a wide range of substrate compatibility and excellent tolerance towards diverse functional groups.</p><h3>Graphical abstract</h3><p>A method for synthesizing 3-substituted isocoumarins under copper catalysis involves the cyclization reaction of o-bromobenzoic acid and alkynes in DMSO, with the assistance of K<sub>2</sub>CO<sub>3</sub> at 100 °C. This reaction demonstrates a synthesis yield of 8–81% for 3-substituted isocoumarins.\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 4","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142598875","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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