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Title: Bidentate coordination behaviour of a potentially tridentate ligand. A mononuclear four-coordinate Ni(II) complex supported by two <i style="">o</i>-iminobenzosemiquinonato units
Authors: Mukherjee, Atasi
Mukherjee, Rabindranath
Keywords: Bioinorganic chemistry
Metal coordinated radicals
Non-innocent ligands
Crystal structures
Issue Date: Mar-2011
Publisher: NISCAIR-CSIR, India
Abstract: Using a new<i style=""> N,O,S</i>–potentially tridentate ligand (H<sub>2</sub>L), a mononuclear Ni<sup>II</sup> complex of composition <b style=""></b> (<b style="">1</b>) has been synthesized. The structure of the complex has been elucidated<b style=""> </b>in the solution state using <sup>1</sup>H NMR spectroscopy and in the solid state by X-ray crystallography. X-ray studies reveal that the Ni<sup>II</sup> is surrounded by two <i>o</i>-iminobenzosemiquinonate(1–) <i><img src='/image/spc_char/pi.gif' border=0></i>-radical ligands, providing a Ni<sup>II</sup>N<sub>2</sub>O<sub>2</sub> square planar coordination environment. Notably, the thioether unit in each ligand remains non-coordinated. Cyclic voltammetric measurements of (<b style="">1</b>) show two one-electron reductive and two one-electron oxidative redox responses, which are ligand-centred in origin. Characterization of electrochemically-generated reduced and oxidized species has also been accomplished.
Description: 484-490
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.50A(03-04) [March-April 2011]

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