Please use this identifier to cite or link to this item: http://nopr.niscair.res.in/handle/123456789/20792
Title: Synthesis, characterisation and redox behaviour of mixed ligand complexes of osmiurn(II/III/IV)
Authors: Chowdhury, Habibar
Bose, Doyel
Rahaman, Sk Hafijur
Ghosh, Barindra Kumar
Issue Date: Nov-2003
Publisher: NISCAIR-CSIR, India
Abstract: A group of mixed-tris chelates of osmium(II), (III) and (IV) of the general formula [OsL'L2]z+ [L' = N-((pyridin-2-yl )formylidene) aniline (pfan) or N-((pyridin-2-yl)benzylidene)aniline (pban); L = 2,2'-bipyridyl (bipy), 2-(III-tolylazo)pyridine (tapy) or quinolin-8-olate (oxin); z = 1-3] have been prepared, isolated as their perchlorates and characterised by physicochemical, magnetic and spectroscopic methods. The complexes exhibit several spinallowed and spin-forbidden charge-transfer transitions in the 1000-200 nm region. In MeCN solutions the chelates display osmium(IV)-osmium(III) and osmium(III)-osmium(II) couples in the range -0.4 to 1.6 V vs SCE. The stability of metal oxidation levels is discussed in terms of the electrochemical result s and correlated to the π-acceptor properties of these ligands. On the negative side of SCE, successive ligand reductions in bipy/tapy complexes are observed involving diimine (-N=C-C=N-)/ azoimine (-N=N-C=N-) group.
Page(s): 2772-2777
URI: http://hdl.handle.net/123456789/20792
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.42A(11) [November 2003]

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