Chemistry of molybdenum. Part 2. Complexes of molybdenum with 2-aminocyclopent-1-ene-1-carbodithioate. Synthesis, characterisation, and electrochemical studies

Abstract

The chemistry of the bidentate (S,S^–) donor ligands 2-aminocyclopent-1-ene-1-carbodithioic acid (HL¹) and its N-alkylated derivatives [alkyl = C₂H₅(HL²), C₄H₉(HL³), or cyclo-C₆H₁₁(HL⁴)] with molybdenum in oxidation states +6 and +5 is described. The Mo^VI compounds are all cis-dioxo-species. Reduction of [MoO₂(L¹)₂] with excess HL¹ yields [MoO(L¹)₃], a monomeric Mo^V compound. The complexes are all intensely coloured due to a ligand-to-metal charge-transfer transition. Infrared electronic, e.s.r., magnetic, and electrochemical studies of these complexes are described. The results are discussed in terms of electronic structure and their relationship to the Mo centre in xanthine oxidase.