Stabilization of high oxidation states in transition metals. An electrochemical and computational study of structurally comparable molybdenum and tungsten complexes

Klaus H. Moock, Stuart A. Macgregor, Graham A. Heath, Sean Derrick, René T. Boeré

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21 Citations (Scopus)

Abstract

Molybdenum and tungsten chlorides, chloride oxides and chloride nitrides as well as thiazene and phosphazene metallacycles were studied by electrochemical methods in CH2Cl2. The different ligand systems have a profound influence on the redox potentials. The stabilization of high valency increases from the hexachloro to pentachlorooxo to chloronitrido complexes and the metallacycles. There is a systematic difference in the electrode potentials between molybdenum and tungsten redox couples. The geometries of the d1 and d0 species, optimized using density functional methods, are in good agreement with the available experimental data and trends in redox data are reproduced by the computed energy difference between the appropriate d1/d0 pair. The relative stability of the higher oxidation state is directly linked to the donor properties of the ligands present, and increases in the order: Cl6 < F6 < Cl5O < Cl4(N3S2) < Cl3(N3P2) < Cl4N.

Original languageEnglish
Pages (from-to)2067-2076
Number of pages10
JournalJournal of the Chemical Society - Dalton Transactions
Issue number10
DOIs
Publication statusPublished - 1996

ASJC Scopus subject areas

  • Chemistry(all)

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