Synthesis and characterisation of a polymer-bound rhodium-benzimidazole complex as catalyst for the hydrogenation of nitroarenes


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Alexander, S. and Udayakumar, V. and Gayathri, V. (2012) Synthesis and characterisation of a polymer-bound rhodium-benzimidazole complex as catalyst for the hydrogenation of nitroarenes. Transition Metal Chemistry, 37 (1). pp. 1-6. ISSN 1572-901X

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A polymer-anchored rhodium complex was synthesised by sequential attachment of benzimidazole (BzlH) and RhCl 3 to chloromethylated poly(styrene-divinylbenzene) co-polymer (PSDVB) with 6.5 cross-linking. The catalyst was characterised by X-ray photoelectron spectroscopy, far-IR, UV-Vis, FTIR, SEM and thermogravimetric analysis. Various physico-chemical properties such as bulk density, surface area and swelling behaviour in different solvents were also studied. The polymer-anchored complex was tested as a catalyst for reduction of nitroarenes, namely o,m,p-nitrobenzoic acid, nitroaniline, nitrophenol and nitrotoluene. Kinetic measurements were carried for o-nitroaniline and p-nitrophenol by varying temperature, catalyst concentration and concentration of substrates. The rate of the reaction was found to be first order with respect to catalyst concentration and also with substrate concentration at low concentrations, becoming independent of substrate at higher concentrations. A plausible mechanism for the reaction is proposed. The energy and entropy of activation calculated from Arrhenius plots indicate high activity of the catalystonthe support.Therecycling efficiencyof the catalyst has been studied and there was no leaching of metal from the catalyst surface. © Springer Science+Business Media B.V. 2011.

Item Type: Article
Additional Information: cited By 1
Uncontrolled Keywords: Benzimidazoles; Bulk density; Catalyst concentration; Catalyst surfaces; Different solvents; Entropy of activation; First order; FTIR; High activity; Kinetic measurement; Low concentrations; Nitroanilines; Nitroarenes; Nitrophenols; Nitrotoluene; P-nitrobenzoic acids; p-Nitrophenol; Physicochemical property; Plausible mechanisms; Rhodium complexes; Styrene-divinylbenzene; Substrate concentrations; Surface area; Swelling behaviour; Varying temperature, Aniline; Arrhenius plots; Carboxylic acids; Catalysts; Chemical properties; Crosslinking; Leaching; Nitrogen compounds; Photoelectrons; Polymers; Rhodium; Styrene; Substrates; Synthesis (chemical); Thermogravimetric analysis; X ray photoelectron spectroscopy, Rhodium compounds
Subjects: Faculty of Science > Pure Sciences > Chemistry
Divisions: Jnana Bharathi / Central College Campus > Department of Chemistry
Depositing User: Mr. Kirana Kumar D
Date Deposited: 05 Apr 2016 07:17
Last Modified: 05 Apr 2016 07:17

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