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Mixed-ligand complexes of osmium(III/IV)8-quinolinolates with one ketoximate ligand

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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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Authors and Affiliations

  1. Department of Chemistry, The University of Burdwan, 713104, Burdwan, India

    Pranab R. Basudhar, Sutapa Sinha, Pradyut K. Das & Barindra K. Ghosh

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  1. Pranab R. Basudhar
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  2. Sutapa Sinha
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  3. Pradyut K. Das
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  4. Barindra K. Ghosh
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Basudhar, P.R., Sinha, S., Das, P.K. et al. Mixed-ligand complexes of osmium(III/IV)8-quinolinolates with one ketoximate ligand. Transition Met Chem 21, 154–157 (1996). https://doi.org/10.1007/BF00136546

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  • DOI: https://doi.org/10.1007/BF00136546

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