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Title: Synthesis, spectral and electrochemical studies of dioxotungsten(Vl) complexes of binucleating schiff bases derived from methylene- or dithio-bis(salicylaldehyde) and various hydrazides
Authors: Maurya, Mannar R
Antony, Deena C
Gopinathan, S
Gopinathan, C
Issue Date: Dec-1995
Publisher: NISCAIR-CSIR, India
Abstract: The syntheses of binuclear dioxotungsten(VI) complexes of the type [(WO2)2L]. where L is a flexibly bridged hexadentate tetraanionic schiff base derived from the condensation of methylene- or dithiobis( salicylaldehyde) with isonicotinoylhydrazide,∙benzoylhydrazide, p-nitrobenzoylhydrazide and furoylhydrazide are reported. The IR and NMR spectral data suggest an oligomeric structure for these complexes in which each tungsten atom achieves a pseudo-octahedral structure via WO->W bridging. Cyclic voltammetric measurements indicate irreversible to quasireversible reduction of the dioxotungsten(VI) complexes to oxotungsten(IV) with a cathodic reduction potential of - 1.0 to - 1.1V vsSCE at the scan rate of 500 mV/s. The bridging methylene (- CH2-) or dithio (- S- S-) group has very little effect on the thermodynamic stability of the complexes.
Page(s): 967-970
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.34A(12) [December 1995]

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