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Issue 1, 2004
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Synthesis, structure and electrochemical properties of some oxime complexes of rhodium

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Abstract

Reaction of the oximes of salicyladehyde (H2L1), 2-hydroxyacetophenone (H2L2) and 2-hydroxynaphthaldehyde (H2L3; general abbreviation H2L, where H2 stands for the two dissociable protons, one phenolic proton and one oxime proton) with [Rh(PPh3)3Cl] afforded a family of rhodium(III) complexes of the type [Rh(PPh3)2(HL)(L)]. The crystal structure of [Rh(PPh3)2(HL2)(L2)] has been determined by X-ray diffraction. One oxime ligand is coordinated via dissociation of only the phenolic proton, while the other oxime ligand is coordinated via dissociation of both the phenolic and oxime protons. Both the oxime ligands are coordinated as bidentate N,O-donors, forming six-membered chelate rings. The complexes are diamagnetic (low-spin d6, S = 0) and their 1H NMR spectra are in excellent agreement with their compositions. All three [Rh(PPh3)2(HL)(L)] complexes display intense absorptions in the visible and ultraviolet regions. Cyclic voltammetry on all the complexes shows two oxidations; the first one is observed within the range 0.61 to 0.76 V vs. SCE and the second one within 1.20 to 1.32 V vs. SCE. There is also one irreversible reduction between −1.05 and −1.30 V vs. SCE.

Graphical abstract: Synthesis, structure and electrochemical properties of some oxime complexes of rhodium

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Publication details

The article was received on 06 Aug 2003, accepted on 26 Sep 2003 and first published on 12 Nov 2003


Article type: Paper
DOI: 10.1039/B309412J
Citation: New J. Chem., 2004,28, 115-119
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    Synthesis, structure and electrochemical properties of some oxime complexes of rhodium

    R. Acharyya, F. Basuli, G. Rosair and S. Bhattacharya, New J. Chem., 2004, 28, 115
    DOI: 10.1039/B309412J

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