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Mixed-ligand complexes of osmium(III/IV)8-quinolinolates with one ketoximate ligand
Authors:Pranab R Basudhar  Sutapa Sinha  Pradyut K Das  Barindra K Ghosh
Institution:(1) Department of Chemistry, The University of Burdwan, 713104 Burdwan, India
Abstract:Summary A group of mixed-tris chelates of type OsAQ2] A = isonitrosoacetophenonate (A1) and isonitroso-propiophenonate (A2); Q = deprotonated 8-quinolinol (Q1) and 2-methyl-8-quinolinol (Q2)] have been prepared by two distinct synthetic approaches. OsAQ2]+, obtained by CeIV oxidation of OsAQ2], can be regenerated by hydrazine hydrate reduction of the former. The complexes, characterized by physico-chemical, magnetic and spectroscopic methods, exhibit several spin-allowed and spin-forbidden charge transfer transitions in their electronic spectra. In MeCN solution the OsN3O3 unit displays a nearly-reversible OsIV-OsIII change and an OsIII-OsII couple in the ca. -1.0– + 0.3V range versus s.c.e. The stability of the metal oxidation levels is discussed in terms of the chemical and electrochemical results.
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