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Synthesis, structural studies and catalytic activity of dioxidomolybdenum(VI) complexes with aroylhydrazones of naphthol-derivative

Pasayat, Sagarika and Dash, Subhashree P and Roy, Satabdi and Dinda, Rupam and Dhaka, Sarita and Maurya, Mannar R and Kaminsky, Werner and Patil, Yogesh P and Nethaji, M (2014) Synthesis, structural studies and catalytic activity of dioxidomolybdenum(VI) complexes with aroylhydrazones of naphthol-derivative. In: POLYHEDRON, 67 . pp. 1-10.

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Official URL: http://dx.doi.org/ 10.1016/j.poly.2013.08.055


Reaction of the salicylhydrazone of 2-hydroxy-1-naphthaldehyde (H2L1), anthranylhydrazone of 2hydroxy-l-naphthaldehyde (H2L2), benzoylhydrazone of 2-hydroxy-1-acetonaphthone (H2L3) and anthranylhydrazone of 2-hydroxy-1-acetonaphthone (H2L4; general abbreviation H2L) with MoO2(acac)21 afforded a series of 5- and 6- coordinate Mo(VI) complexes of the type MoO2L1-2(ROH)] where R = C2H5 (1) and CH3 (2)], and MoO2L3-4] (3 and 4). The substrate binding capacity of 1 has been demonstrated by the formation of one mononuclear mixed-ligand dioxidomolybdenum complex MoO2L1(Q)] (where Q= gamma-picoline (la)). Molecular structure of all the complexes (I, la, 2,3 and 4) is determined by X-ray crystallography, demonstrating the dibasic tridentate behavior of ligands. All the complexes show two irreversible reductive responses within the potential window -0.73 to -1.08 V, due to Movl/Mov and Mov/Mow processes. Catalytic potential of these complexes was tested for the oxidation of benzoin using 30% aqueous H2O2 as an oxidant in methanol. At least four reaction products, benzoic acid, benzaldehydedimethylacetal, methyl benzoate and benzil were obtained with the 95-99% conversion under optimized reaction conditions. Oxidative bromination of salicylaldehyde, a functional mimic of haloperoxidases, in aqueous 1-1202/KEr in the presence of HC1O4 at room temperature has also been carried out successfully. (C) 2013 Elsevier Ltd. All rights reserved.

Item Type: Journal Article
Publication: POLYHEDRON
Additional Information: Copyright for this article belongs to the authors.
Keywords: Aroylhydrazones; Naphthol-derivative; Dioxidomolybdenum(VI) complexes; X-ray crystal structure; Catalytic oxidation of benzoin; Oxidative bromination
Department/Centre: Division of Chemical Sciences > Organic Chemistry
Date Deposited: 21 Feb 2014 06:25
Last Modified: 21 Feb 2014 06:25
URI: http://eprints.iisc.ac.in/id/eprint/48421

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