Synthesis and characterization of silica-supported cobalt acylpyrazolone complex and its catalytic performance in ethylbenzene oxidation

IF 4 2区化学 Q2 CHEMISTRY, PHYSICAL

Journal of Molecular Structure Pub Date : 2024-10-31 DOI:10.1016/j.molstruc.2024.140513

Grishma Vala , Rajendrasinh N. Jadeja , Aditya A. Puranik , Ray J. Butcher

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Abstract

A novel β-diketone-containing acylpyrazolone (2-(3-chlorophenyl)-3‑hydroxy-5-methyl-2,3-dihydro-1H-pyrazole-4-yl) (4-nitrophenyl) methanone [HL^C] ligand and its cobalt complex [Co(HL^C)₂(H₂O)₂] were synthesized and characterized. A silica-supported cobalt complex was synthesized as a heterogeneous catalyst to investigate the cobalt complex's catalytic activity. The characterization techniques used for the synthesized compounds are CHN analysis, SC-XRD, FT-IR, TGA, DRS spectra, BET and BJH measurements, ICP-MS, XPS, powder XRD and SEM. Without any solvent, the cobalt complex catalytic impact on the oxidation of ethylbenzene was investigated with tert‑butyl hydroperoxide (70 % TBHP) as an oxidant. The catalyst exhibited good conversion (88 % conversion) and selectivity (83 % acetophenone) in the oxidation of ethylbenzene. The catalyst shows no leaching occurred under the reaction conditions because it is stable and reusable for further reaction.

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二氧化硅支撑的酰基吡唑酮钴络合物的合成和表征及其在乙苯氧化中的催化性能

合成并表征了一种新的含β-二酮酰基吡唑酮（2-(3-氯苯基)-3-羟基-5-甲基-2,3-二氢-1H-吡唑-4-基）（4-硝基苯基）甲酮[HLC]配体及其钴络合物[Co(HLC)2(H2O)2]。为了研究钴络合物的催化活性，还合成了一种二氧化硅支撑的钴络合物作为异相催化剂。合成化合物的表征技术包括 CHN 分析、SC-XRD、FT-IR、TGA、DRS 光谱、BET 和 BJH 测量、ICP-MS、XPS、粉末 XRD 和 SEM。在不使用任何溶剂的情况下，以叔丁基过氧化氢（70% TBHP）为氧化剂，研究了钴络合物对乙苯氧化的催化作用。催化剂在乙苯氧化过程中表现出良好的转化率（88% 转化率）和选择性（83% 苯乙酮）。该催化剂在反应条件下没有发生浸出现象，因为它很稳定，可重复用于进一步反应。

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来源期刊

Journal of Molecular Structure 化学-物理化学

CiteScore

7.10

自引率

15.80%

发文量

2384

审稿时长

45 days

期刊介绍： The Journal of Molecular Structure is dedicated to the publication of full-length articles and review papers, providing important new structural information on all types of chemical species including: • Stable and unstable molecules in all types of environments (vapour, molecular beam, liquid, solution, liquid crystal, solid state, matrix-isolated, surface-absorbed etc.) • Chemical intermediates • Molecules in excited states • Biological molecules • Polymers. The methods used may include any combination of spectroscopic and non-spectroscopic techniques, for example: • Infrared spectroscopy (mid, far, near) • Raman spectroscopy and non-linear Raman methods (CARS, etc.) • Electronic absorption spectroscopy • Optical rotatory dispersion and circular dichroism • Fluorescence and phosphorescence techniques • Electron spectroscopies (PES, XPS), EXAFS, etc. • Microwave spectroscopy • Electron diffraction • NMR and ESR spectroscopies • Mössbauer spectroscopy • X-ray crystallography • Charge Density Analyses • Computational Studies (supplementing experimental methods) We encourage publications combining theoretical and experimental approaches. The structural insights gained by the studies should be correlated with the properties, activity and/ or reactivity of the molecule under investigation and the relevance of this molecule and its implications should be discussed.