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Synthesis of UiO-66-SO3H-Cl as the recyclable multifunctional catalyst for efficient conversion of glucose to 5–Hydroxymethylfurfural 合成 UiO-66-SO3H-Cl 作为可回收的多功能催化剂,用于将葡萄糖高效转化为 5-羟甲基糠醛
IF 1.7 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2024-02-22 DOI: 10.1007/s12039-023-02245-3
Molood Falsafin, Kamal Ghani, Arash Shokrollahi

5-Hydroxymethylfurfural (HMF), a leading platform combination for altering biomass to diverse biomass-derived chemicals and biofuels, has been engrossed in spacious consideration. In this perusal, a new catalyst modified with sulfonic acid and -Cl functional group UiO-66-SO3H-Cl was first used as an efficiently heterogeneous catalyst with the overlapping effect of three functional groups of Lewis acid, Brønsted acid and -Cl group binding site was synthesized to convert glucose to HMF. The Lewis acid site is responsible for the isomerization of glucose to fructose, and the dehydration of fructose to HMF is the responsibility of the Brønsted acid site. The -Cl group facilitates the hydrolysis of glucose by forming a hydrogen bond with glucose and reducing the activation energy, thus increasing the production rate of HMF. The synthesized catalysts were analyzed using XRD, FT-IR, FE-SEM, EDS, and XPS. The amount of Zr, Cl, and S elements reported in the newly synthesized catalyst in this research by EDS is 37.44%, 1.01%, and 6.8%, respectively. The existence of C 1s (284.8 eV), O 1s (531.9 eV), Cl 2p (200.4 eV), Zr 3d (185.2 eV), and S 2p (168.4 eV) of UiO-66-SO3H-Cl was confirmed by conducting XPS analysis. The reaction range of 5-HMF produced from glucose by each of UiO-66, UiO-66-SO3H, and UiO-66-SO3H-Cl catalysts, was 10%, 23% and 74%, respectively, as determined by UV-Vis analysis was decided the results show that the UiO-66-SO3H-Cl catalyst with three functional groups synergistically increases the production of HMF from glucose.

Graphical Abstract

Conversion of glucose to HMF by UiO-66-SO3H-Cl multifunctional solid catalyst: Lewis acid (Zr cation) and Brønsted acid (SO3H group) are active sites for isomerizing glucose to fructose and dehydration of fructose to HMF, respectively. The -Cl group forms a hydrogen bond with glucose, increasing the production rate of HMF.

摘要 5-羟甲基糠醛(HMF)是将生物质转化为多种生物质衍生化学品和生物燃料的主要平台组合,一直受到广泛关注。在这一研究中,首先合成了一种用磺酸和 -Cl 官能团 UiO-66-SO3H-Cl 修饰的新型催化剂,它是一种高效的异相催化剂,具有路易斯酸、布氏酸和 -Cl 官能团结合位点三种官能团的重叠效应,可将葡萄糖转化为 HMF。路易斯酸位点负责将葡萄糖异构化为果糖,而将果糖脱水为 HMF 则由布伦斯特酸位点负责。-Cl基团通过与葡萄糖形成氢键来促进葡萄糖的水解,降低活化能,从而提高 HMF 的生产率。利用 XRD、FT-IR、FE-SEM、EDS 和 XPS 对合成的催化剂进行了分析。通过 EDS 分析,本研究中新合成的催化剂中 Zr、Cl 和 S 元素的含量分别为 37.44%、1.01% 和 6.8%。通过 XPS 分析证实了 UiO-66-SO3H-Cl 中 C 1s (284.8 eV)、O 1s (531.9 eV)、Cl 2p (200.4 eV)、Zr 3d (185.2 eV) 和 S 2p (168.4 eV) 的存在。通过紫外可见光谱分析确定了 UiO-66、UiO-66-SO3H 和 UiO-66-SO3H-Cl 催化剂从葡萄糖制取 5-HMF 的反应范围分别为 10%、23% 和 74%,结果表明具有三个官能团的 UiO-66-SO3H-Cl 催化剂能协同提高葡萄糖的 HMF 产量。 图表摘要 UiO-66-SO3H-Cl 多功能固体催化剂将葡萄糖转化为 HMF:路易斯酸(Zr 阳离子)和布氏酸(SO3H 基团)分别是葡萄糖异构化为果糖和果糖脱水为 HMF 的活性位点。-Cl 基团与葡萄糖形成氢键,提高了 HMF 的生产率。
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引用次数: 0
Synthesis of Au/Cu2O/graphene quantum dots nanocomposites and its application for glucose oxidation 金/铜/石墨烯量子点纳米复合材料的合成及其在葡萄糖氧化中的应用
IF 1.7 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2024-02-16 DOI: 10.1007/s12039-023-02239-1
Ngo Nguyen Tra My, Tran Thi Bich Quyen, Tran Minh Khang, Bui Le Anh Tuan, Doan Van Hong Thien

In this study, the novel Au/Cu2O/Graphene quantum dots nanocomposites have been synthesized via a fast, simple and environmentally friendly method for the first time. Specifically, Cu2O nanocubes (Cu2O NCBs) synthesized by a reduction reaction at room temperature were combined with Au nanoparticles (Au NPs) and Graphene quantum dots (GQDs) obtained from low-cost and naturally abundant material. The synthesized Au/Cu2O/GQDs were characterized by UV-vis, FTIR, XRD, TEM, FESEM, and EDS. The results show that the Au/Cu2O/GQDs have an average size of about 32-36 nm, in which the diameter of Au NPs is ~28-32 nm, Cu2O particles have the form of nanocube with the size of ~29-33 nm and GQDs are small spherical with an average size of ~5 nm. In addition, the electrochemical properties of the Au/Cu2O/GQDs electrodes were investigated using the cyclic voltammetry (CV) technique. The obtained results show that the Au/Cu2O/GQDs have high electroactivity, which are very potential and promising to be used in glucose sensor with a very wide concentration of glucose detection range from 10-10 M to 1 M with a the LOD of 70 nM (7×10-8 M) and a high sensitivity of 32.5 μAμM-1cm-2. Therefore, Au/Cu2O/GQDs will be potential candidate for non-enzymatic sensitive glucose sensors in the future.

Graphical abstract

Cu2O nanocubes (Cu2O NCBs) were successfully combined with Au nanoparticles (Au NPs) and Graphene quantum dots (GQDs) to generate Au/Cu2O/GQDs nanocomposites. The properties and morphology of synthesized Au/Cu2O/GQDs were also studied. Au/Cu2O/GQDs showed promising electrochemical activity and performed its applicability for glucose detection with a wide concentration of glucose detection range from 10-10 M to 1 M.

本研究首次采用快速、简单、环保的方法合成了新型金/Cu2O/石墨烯量子点纳米复合材料。具体来说,在室温下通过还原反应合成的 Cu2O 纳米立方体(Cu2O NCBs)与金纳米颗粒(Au NPs)和石墨烯量子点(GQDs)结合在一起。对合成的 Au/Cu2O/GQDs进行了紫外可见光、傅立叶变换红外光谱、XRD、TEM、FESEM 和 EDS 表征。结果表明,Au/Cu2O/GQDs 的平均尺寸约为 32-36 nm,其中 Au NPs 的直径约为 28-32 nm,Cu2O 颗粒为纳米立方体,尺寸约为 29-33 nm,GQDs 为小球形,平均尺寸约为 5 nm。此外,还利用循环伏安法(CV)技术研究了 Au/Cu2O/GQDs 电极的电化学特性。结果表明,Au/Cu2O/GQDs 具有很高的电活性,非常有潜力和前景用于葡萄糖传感器,其葡萄糖检测浓度范围从 10-10 M 到 1 M,LOD 为 70 nM (7×10-8 M),灵敏度高达 32.5 μAμM-1cm-2。图解摘要Cu2O纳米立方体(Cu2O NCBs)与金纳米颗粒(Au NPs)和石墨烯量子点(GQDs)成功结合生成了Au/Cu2O/GQDs纳米复合材料。此外,还对合成的 Au/Cu2O/GQDs 的性质和形态进行了研究。Au/Cu2O/GQDs 显示出良好的电化学活性,可用于葡萄糖检测,检测浓度范围从 10-10 M 到 1 M。
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引用次数: 0
Synthesis of rhodium catalyst [Rh(cod)(TTT)2] with amino group ligand and its catalytic performance for phenylacetylene polymerization 含氨基配体的铑催化剂[Rh(cod)(TTT)2]的合成及其在苯乙炔聚合中的催化性能
IF 1.7 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2024-02-15 DOI: 10.1007/s12039-023-02246-2
Mingyu Zhang, Dong Yan, Rui Xu, Yuqi Tang, Shuangping Xu, Yanqing Qu, Jingyu Xu, Boyu Du, Hongge Jia

A new rhodium complex [Rh(cod)(TTT)2] was synthesized by [Rh(cod)Cl]2 as a precursor, and 4,4',4''-(1,3,5-triazine-2,4,6-triyl)trianiline (TTT) as a ligand. Its structure was verified by 1H and 13C NMR. The results indicate that the complex shows high activity in phenylacetylene polymerization. It was applied to the polymerization of phenylacetylene with a yield of 45.0% and Mw = 2.26×105 at ultra-low rhodium feed ratio ([Rh.]/[M.]=1/60000).

Graphical abstract

A new rhodium complex [Rh(cod)(TTT)2] was synthesized by [Rh(cod)Cl]2 as a precursor, and 4,4',4''-(1,3,5-triazine-2,4,6-triyl)trianiline (TTT) as a ligand. It was applied to the polymerization of phenylacetylene with a yield of 45.0% and Mw = 2.26×105 at ultra-low rhodium feed ratio ([Rh.]/[M.]=1/60000

以[Rh(cod)Cl]2 为前体,4,4',4''-(1,3,5-三嗪-2,4,6-三基)三苯胺(TTT)为配体,合成了一种新的铑配合物[Rh(cod)(TTT)2]。通过 1H 和 13C NMR 验证了其结构。结果表明,该配合物在苯乙炔聚合中表现出很高的活性。在超低铑进料比([Rh.]/[M.]=1/60000)条件下,该配合物用于苯乙炔的聚合,产率为 45.0%,Mw = 2.26×105。图解摘要 以[Rh(cod)Cl]2 为前驱体,4,4',4''-(1,3,5-三嗪-2,4,6-三基)三苯胺 (TTT) 为配体,合成了一种新的铑配合物[Rh(cod)(TTT)2]。它被用于苯乙炔的聚合,在超低铑进料比([Rh.]/[M.]=1/60000)条件下,产率为 45.0%,Mw = 2.26×105
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引用次数: 0
Incorporation of Ag decorated rGO ON TiO2/dye photoanode for dye-sensitized solar cell applications 在 TiO2/染料光阳极上加入银装饰的 rGO,用于染料敏化太阳能电池应用
IF 1.7 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2024-02-12 DOI: 10.1007/s12039-023-02248-0
M Sheeba Gnana Selvi, G V Vijayaraghavan, B Janarthanan, K Inbarajan

A dye-sensitized solar cell (DSSC) has been fabricated with a photoanode made with silver-decorated reduced graphene oxide over the layer of TiO2 nanoparticle coated over the FTO substrate using the Doctor Blade method. Due to the excellent electrical conductivity of silver decorated reduced graphene oxide and high adsorption of dye molecules, the cell parameters are enhanced. Three different concentrations of Ag decorated rGO (0.1% wt, 0.2% wt, and 0.3% wt) have been considered for this study and are compared with pure TiO2-based DSSC. It is confirmed that the 0.1% wt concentration of TiO2-Ag decorated rGO has shown better performance than the other concentrations as well as the pure TiO2 photoanode. Natural dyes having chlorophyll pigment have been used as sensitizers, and graphene-based counter electrodes are incorporated in all solar cells. DSSC of 0.1% wt concentration of TiO2-Ag decorated rGO has given short circuit current density, open circuit voltage, fill factor, and power conversion efficiency of 3.768 mA/cm2, 0.6518 V, 0.566, and 1.39%, respectively. The higher the concentration of Ag decorated rGO with TiO2, the lower the electron injection into the semiconductor oxide with increased band gap energy.

In this experiment, we found that 0.1% wt concentration of TiO2-Ag decorated rGO has given a short power conversion efficiency of 1.39%, respectively.

摘要 利用刮刀法,在涂覆在 FTO 基底上的 TiO2 纳米粒子层上用银装饰的还原氧化石墨烯制造了光阳极,从而制造出了染料敏化太阳能电池(DSSC)。由于银装饰的还原氧化石墨烯具有优异的导电性和对染料分子的高吸附性,从而提高了电池参数。本研究考虑了三种不同浓度的银装饰还原氧化石墨烯(0.1% wt、0.2% wt 和 0.3% wt),并与基于纯 TiO2 的 DSSC 进行了比较。结果表明,0.1% wt 浓度的 TiO2-Ag 装饰 rGO 比其他浓度以及纯 TiO2 光阳极具有更好的性能。具有叶绿素色素的天然染料被用作敏化剂,而基于石墨烯的对电极被纳入所有太阳能电池中。重量浓度为 0.1% 的 TiO2-Ag 装饰 rGO DSSC 的短路电流密度、开路电压、填充因子和功率转换效率分别为 3.768 mA/cm2、0.6518 V、0.566 和 1.39%。Ag装饰的rGO与TiO2的浓度越高,电子注入半导体氧化物的量越少,带隙能增加。 图形摘要 在本实验中,我们发现重量浓度为 0.1% 的 TiO2-Ag 装饰 rGO 的短功率转换效率分别为 1.39%。
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引用次数: 0
A kinetic and mechanistic investigation of oxidation of D-Mannitol by Diperiodatocuprate (III) in an aqueous alkaline medium 在碱性水介质中双碘铜酸盐 (III) 氧化 D-甘露醇的动力学和机理研究
IF 1.7 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2024-02-12 DOI: 10.1007/s12039-023-02240-8
Sandeep R Kurundawade, Sharanappa T Nandibewoor

The study investigates the kinetics associated with the oxidation of D-Mannitol (D-Mann) by diperiodatocuprate(III) (DPC) in an aqueous alkaline medium using spectrophotometric method. Reaction medium’s ionic strength was maintained constant at 0.60 mol dm-3. First-order kinetics in [DPC] and less than unit order for [D-Mann] and [alkali] were observed in the reaction. It was of the negative fractional order in [periodate]. It was determined that the reaction of substrate D-Mann with DPC in an alkaline medium shows 1(D-Mann):4(DPC) stoichiometry. Ionic strength of the medium had no effect on the rate of reaction and same was the observation with dielectric constant. The products of reaction were identified by FTIR and confirmed by LC-ESI-MS spectral data. The reaction constants for each step of the mechanism were determined. For the slow step of reaction mechanism, activation parameters were calculated and discussed. Further, thermodynamic quantities for the reactions were also estimated.

Graphical abstract

Based on the literature survey, DPC was chosen for the current study. DPC was prepared by the reported methods as cited in the manuscript. Stable reaction mixtures were prepared in two different reagent bottles and maintained at a desired temperature using a water bath. The reaction between the oxidant DPC and substrate D-Mannitol was spectrophotometrically analyzed by a UV-Vis spectrophotometer. With the help of data obtained, graphs were plotted to obtain kobs for different variations, and the mechanism was synthesized. A rate law for the reaction under investigation was proposed based on the results and mechanism.

本研究采用分光光度法研究了在水性碱性介质中二碘杯酸盐(III)(DPC)氧化 D-甘露醇(D-Mann)的相关动力学。反应介质的离子强度恒定为 0.60 摩尔 dm-3。在反应中观察到[DPC]的一阶动力学,而[D-曼]和[碱]的小于单位阶。在[高碘酸盐]中为负分数阶。据测定,底物 D-Mann 与 DPC 在碱性介质中的反应呈 1(D-Mann):4(DPC)的化学计量学关系。介质的离子强度对反应速率没有影响,介电常数也是如此。反应产物经傅立叶变换红外光谱鉴定,并经 LC-ESI-MS 光谱数据确认。确定了反应机制各步骤的反应常数。对于反应机理的慢步骤,计算并讨论了活化参数。此外,还估算了反应的热力学量。根据手稿中引用的报告方法制备了 DPC。在两个不同的试剂瓶中制备稳定的反应混合物,并用水浴保持在所需的温度下。氧化剂 DPC 和底物 D-Mannitol 之间的反应用紫外可见分光光度计进行分析。根据所获得的数据,绘制了图表,以获得不同变化的 kobs,并合成了机理。根据结果和机理,提出了所研究反应的速率定律。
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引用次数: 0
Comparative DNA binding ability and phosphatase-like activity of mono and dinuclear Ni (II) complexes: a structure-activity correlation 单核和双核 Ni (II) 复合物的 DNA 结合能力和类似磷酸酶活性的比较:结构与活性的相关性
IF 1.7 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2024-02-12 DOI: 10.1007/s12039-023-02242-6
Vaishali Yadav, Rohitash Kumar,  Rishu, Vimal K Bhardwaj

Two Ni(II) complexes [(Ni L1)(CH3COO) (H2O)2](1) and [{(NiL2) (CH3COO)}2 (µ-H2O)] (2) having different coordination environments around metal centres have been selected to investigate structure-activity correlation for DNA binding and homogenous phosphatase-like activities. Complex 1 is a monomer in which the octahedral Ni(II) center is coordinated to phenolate oxygen along with two nitrogen atoms from imine and amine groups of the deprotonated ligand HL1. An oxygen atom of the acetate group is coordinated in monodentate mode, and two coordinated water molecules occupy the other two axial sites. Complex 2 is a dimer where each Ni(II) centre is coordinated in an octahedral environment through one imine nitrogen, one amine nitrogen, two bridging phenolate oxygens from two deprotonated ligands (HL2) molecules, a mono-dentate acetate group, and a bridging water molecule. The role of structural features of both the complexes has been studied in DNA binding activity and phosphate ester bond cleavage of bis(4-nitrophenyl) phosphate (BNPP) as a model substrate. Complex 2 showed higher DNA binding ability than complex 1 due to its stable bridging structure and high nuclearity. The catalytic phosphate ester bond hydrolysis of BNPP was explored with both complexes spectrophotometrically. The dinuclear complex 2 also exhibited a higher rate of acceleration in the BNPP hydrolysis than mononuclear complex 1. The active nucleophile from the coordinated water and cooperativity in two metal centres of complex 2 are the key features to cleave the phosphate ester bond of the substrate. Further, the first-order rate constants and various kinetic parameters based on the Michaelis-Menten equation were calculated for each complex. A significant phosphatase-like activity for complex 2 has been observed with a turnover number of 1.23 × 10−2 s−1.

Graphical abstract

A structure-activity relationship for phosphatase-like catalytic activities of two mono and di nuclear Ni(II) complexes has been studied. Dinuclear complex 2 exhibits higher phosphatase-like activity due to coordinated water molecules and cooperativity between two metal centres.

我们选择了金属中心周围具有不同配位环境的两种 Ni(II) 复合物[(Ni L1)(CH3COO) (H2O)2](1) 和[{(NiL2) (CH3COO)}2 (µ-H2O)](2) 来研究 DNA 结合和同源磷酸酶类活性的结构-活性相关性。配合物 1 是一种单体,其中的八面体 Ni(II) 中心与苯酚氧以及来自去质子化配体 HL1 的亚胺和胺基团的两个氮原子配位。醋酸基团的一个氧原子以单配位方式配位,两个配位水分子占据另外两个轴向位点。配合物 2 是一种二聚体,其中每个 Ni(II) 中心都通过一个亚胺氮、一个胺氮、来自两个去质子化配体(HL2)分子的两个桥接苯酚氧原子、一个单齿型醋酸基团和一个桥接水分子在八面体环境中配位。研究人员以双(4-硝基苯基)磷酸酯(BNPP)为模型底物,研究了这两种复合物的结构特征在 DNA 结合活性和磷酸酯键裂解中的作用。由于其稳定的桥接结构和高核度,复合物 2 比复合物 1 显示出更高的 DNA 结合能力。通过分光光度法研究了这两种复合物对 BNPP 磷酸酯键水解的催化作用。与单核复合物 1 相比,双核复合物 2 在 BNPP 的水解过程中表现出更高的加速度。来自配位水的活性亲核剂和复合物 2 中两个金属中心的合作性是裂解底物磷酸酯键的关键特征。此外,还根据 Michaelis-Menten 方程计算了每个复合物的一阶速率常数和各种动力学参数。图解摘要 研究了两种单核和双核 Ni(II) 复合物的类似磷酸酶催化活性的结构-活性关系。由于配位水分子和两个金属中心之间的协同作用,双核配合物 2 表现出更高的类似磷酸酶的活性。
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引用次数: 0
Oxidative decarboxylation of arylacetic acids and arylacetic esters with singlet molecular oxygen generated from trans-5-hydroperoxy-3,5-dimethyl-1,2-dioxolan-3-yl ethaneperoxate 反式-5-氢过氧-3,5-二甲基-1,2-二氧戊环-3-基乙内酯产生的单线态分子氧对芳基乙酸和芳基乙酸酯的氧化脱羧作用
IF 1.7 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2024-02-12 DOI: 10.1007/s12039-023-02243-5
Z Najminejad

An efficient method for the oxidative decarboxylation of arylacetic acids and arylacetic esters using trans-5-hydroperoxy-3,5-dimethyl-1,2-dioxolane-3-yl ethaneperoxate in combination with KOH as base is reported. The decarboxylation of carboxylic acids and their derivatives was efficiently achieved with singlet molecular oxygen. Singlet molecular oxygen was produced in situ from the fragmentation of the trans-5-hydroperoxy-3,5-dimethyl-1,2-dioxolane-3-yl ethaneperoxate in the presence of KOH, and it has been explored as an effective oxidant for oxidative decarboxylation of arylacetic acids. Further investigation showed that the reaction also permits the synthesis of aromatic ketones by oxidative decarboxylation of arylacetic esters.

Graphical abstract

An efficient method for the oxidative decarboxylation of arylacetic acids and arylacetic esters is reported.The decarboxylation of carboxylic acids and their derivatives were efficiently achieved with singlet molecular oxygen. Singlet molecular oxygen was produced insitu from fragmentation of the trans-5-hydroperoxy-3,5-dimethyl-1,2- dioxolane-3-yl ethaneperoxate in the presence of KOH, and it has been explored as an effective oxidant for oxidative decarboxylation of arylacetic acids and arylacetic esters.

报告中介绍了一种使用反式-5-氢过氧-3,5-二甲基-1,2-二氧戊环-3-基乙醇过氧化物与 KOH 作为碱对芳基乙酸和芳基乙酸酯进行氧化脱羧的高效方法。利用单线态分子氧有效地实现了羧酸及其衍生物的脱羧反应。在 KOH 存在下,反式-5-氢过氧-3,5-二甲基-1,2-二氧戊环-3-乙内过氧乙酸酯在原位碎裂产生单线态分子氧,并将其作为一种有效的氧化剂用于芳基乙酸的氧化脱羧反应。进一步的研究表明,该反应还可以通过芳基乙酸酯的氧化脱羧合成芳香酮。单线分子氧是反式-5-氢过氧-3,5-二甲基-1,2-二氧戊环-3-基乙醇过氧化物在 KOH 的存在下碎裂而产生的,它已被探索用作芳基乙酸和芳基乙酸酯氧化脱羧的有效氧化剂。
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引用次数: 0
Star-shaped Te(VI)-Te(VI) complex and an octanuclear heterometallic Te2Sb6 oxo cluster 星形 Te(VI)-Te(VI)配合物和八核异金属 Te2Sb6 氧簇
IF 1.7 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2024-02-08 DOI: 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,&nbsp;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}
引用次数: 0
Interplay of structure and dynamics in reaction pathways, chemical reactivity and biological systems 反应路径、化学反应性和生物系统中结构与动力学的相互作用
IF 1.7 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2024-02-03 DOI: 10.1007/s12039-023-02233-7
Dilip K Maity, Satrajit Adhikari, Susanta Mahapatra
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引用次数: 0
KOH-catalyzed cross-coupling of primary and secondary alcohols: evidence for radical pathways KOH 催化的伯醇和仲醇交叉偶联:自由基途径的证据
IF 1.7 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2024-01-18 DOI: 10.1007/s12039-023-02241-7
Amlan Subhadarshi Nayak, Shubham Jaiswal, Manas Kumar Sahu, Chidambaram Gunanathan

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.

报告了一种简单的碱、KOH 催化的伯醇和仲醇交叉偶联反应,其中伯醇起着烷基化试剂的作用。EPR 和机理研究证实了由伯醇和仲醇分别形成的自由基和酮中间体的参与,导致了 β-烷基化仲醇的形成。
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Journal of Chemical Sciences
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