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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/25235
Title: Synthesis, characterization and catalytic potentials of polymer anchored copper(II), oxovanadium(IV) and dioxomolybdenum(VI) complexes of 2-(α-hydroxymethyl)benzimidazole
Authors: Maurya, Mannar Ram
Sikarwar S.
Joseph T.
Manikandan P.
Halligudi S.B.
Published in: Reactive and Functional Polymers
Abstract: 2-(α-Hydroxymethyl)benzimidazole (Hhmbmz) has been covalently anchored to chloromethylated polystyrene cross-linked with 5% divinylbenzene. This chelating resin reacts with cupric acetate, vanadyl sulphate and [MoO 2(acac)2] (Hacac = acetylacetone) in presence of Hhmbmz to give complexes PS-[Cu(hmbmz)2], PS-[VO(hmbmz)2] and PS-[MoO2(hmbmz)2] (where, PS-hmbmz = deprotonated 2-(α-hydroxymethyl) benzimidazole covalently linked with polymer), respectively. These complexes were characterized by elemental analyses, FT-IR, EPR and electronic spectra, SEM and TGA-DTA methods. EPR results indicate that complexes are well dispersed in the polymeric support. Complexes PS-[Cu(hmbmz)2] and PS-[VO(hmbmz)2] have been used as catalysts for the oxidation of styrene and ethyl benzene while PS-[VO(hmbmz)2] and PS-[MoO2(hmbmz)2] for the oxidative bromination of salicylaldehyde. Oxidation of styrene gives three major products, styrene oxide, benzaldehyde and benzoic acid while ethyl benzene gives acetophenone as the major product. Oxidative bromination of salicylaldehyde using H2O2/KBr gives 5- bromosalicylaldehyde selectively in quantitative yield. EPR spectra of both freshly prepared and recovered catalysts are identical, which indicate that the metal-Schiff base moiety is intact and the coordination environments are not altered during the reaction. © 2005 Elsevier B.V. All rights reserved.
Citation: Reactive and Functional Polymers, 63(1): 71-83
URI: https://doi.org/10.1016/j.reactfunctpolym.2005.02.008
http://repository.iitr.ac.in/handle/123456789/25235
Issue Date: 2005
Keywords: 2-(α-hydroxymethyl)benzimidazole
Oxidation of styrene and ethyl benzene
Oxidative bromination of salicylaldehyde
Polymer anchored-complexes
ISSN: 13815148
Author Scopus IDs: 7005255411
8641874100
7101924050
55767788400
7005715889
Author Affiliations: Maurya, M.R., Department of Chemistry, Indian Inst. of Technology Roorkee, Roorkee 247 667, India
Sikarwar, S., Department of Chemistry, Indian Inst. of Technology Roorkee, Roorkee 247 667, India
Joseph, T., Inorg. Chem. and Catalysis Division, National Chemical Laboratory, Pune 411008, India
Manikandan, P., Inorg. Chem. and Catalysis Division, National Chemical Laboratory, Pune 411008, India
Halligudi, S.B., Inorg. Chem. and Catalysis Division, National Chemical Laboratory, Pune 411008, India
Funding Details: One of the authors (S.S.) is thankful to Indian Institute of Technology Roorkee for providing fellowship. Indian Institute of Technology Roorkee, IITR
Corresponding Author: Maurya, M.R.; Department of Chemistry, , Roorkee 247 667, India; email: rkmanfcy@iitr.ernet.in
Appears in Collections:Journal Publications [CY]

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