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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|
Metal coordinated radicals
|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.|
|Appears in Collections:||IJC-A Vol.50A(03-04) [March-April 2011]|
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|IJCA 50A(03-04) 484-490.pdf||213.78 kB||Adobe PDF||View/Open|
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