Co-ordination chemistry of manganese. Part III. The reaction of manganese(II) halides with tertiary phosphine and arsine ligands to produce ligand oxide complexes

Abstract

Triphenyl-phosphine and -arsine react with manganese(II) halides to produce Mn(OEPh₃)₂X₂(E = P, As; X = Cl, Br, I) complexes; this implies than an earlier report of Mn(EPh₃)₂X₂ complexes is mistaken. Similarly the bidentate ligands bisdiphenylphosphinomethane, cis-1,2-bisdiphenylphosphinoethylene, 1,2-bisdiphenylphosphinoethane, and 1,2-bisdiphenylarsinoethane react with MnX₂ to form Mn(ligand dioxide)X₂ complexes. Manganous chloride and bromide react with diphenylphosphine to form bis(diphenylphosphinite)manganese(II), a novel reaction involving both ligand deprotonation and oxidation. A possible mechanism of the oxidation of these ligands is discussed.