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IJC-A Vol.48A(01) [January 2009] >


Title: Cobalt and nickel complexes of a hypodentate ligand, 2-[3-(pyridylamino)phenylazo]pyridine: Synthesis, structure and properties
Authors: Banerjee, Priyabrata
Peng, Shie-Ming
Lee, Gene Hsiang
Goswami, Sreebrata
Keywords: Cobalt
Nickel
Hypodentate ligands
Azo compounds
X-ray structure
Issue Date: Jan-2009
Publisher: CSIR
IPC CodeInt. Cl. ⁸ C07F15/04; C07F15/06
Abstract: Reactions of the salts MCl₂∙nH₂O (M = Co, Ni), with the extended azoaromatic ligand, 2-[3-(pyridylamino)- phenylazo]pyridine (HL¹) afford the mononuclear complexes, [M(L¹)₂]m⁺ ( M=Co, m=1 and M=Ni, m=0) in high yields. X-ray structure of the nickel complex is reported. The structural analysis has revealed that two monoanionic ligands [L¹]⁻ bind the metal centre in a N₆-fashion using pairs of pyridyl-N, azo-N and deprotonated arylamido-N atoms. The two N(py) atoms (of the 3-amino pyridyl function) remain as pendents and unused. Positive ion ESI mass spectra of the complexes provide evidence for the integrity of the complexes in solution. Their UV-visible spectra consist of intense transitions in the low energy area of the visible region. Cyclic voltammetry of these complexes displays multiple reversible waves. The Co(III)/Co(II) reduction and Ni(II)/Ni(III) oxidation in their respective complexes appear at - 0.24 and 0.57V, respectively.
Page(s): 25-29
ISSN: 0376-4710
Source: IJC-A Vol.48A(01) [January 2009]

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