Synthesis and characterization of cobalt(II), nickel(II) and copper(II) perchlorate complexes with bis [(diphenylphosphinyl)methyl] phenylphosphine oxide, bis [(disphenylphosphinyl)methyl]ethyl phosphinate, and bis [(diphenylphosphinyl)methyl] phosphinic acid

Abstract

The synthesis and characterization of cobalt(II), nickel(II) and copper(II) perchlorate complexes containing bis [(diphenylphosphinyl)methyl] [phenylphosphine oxide (RPPH), bis [(diphenylphosphinyl)methyl] ethyl phosphinate (RPOEt), and bis [(diphenylphosphinyl)methyl] phosphinic acid (RPOH) have been studied. The substituent at the central phosphorus atom of the ligand is responsible for the types of complexes formed. The new complexes [M(RPPh) 2(ClO 4) 2.nH 2O, [M(RPPh) 3](ClO 4) 2.4H 2O, [M(RPOEt) 2](ClO 4) 2.2H 2O, and [M(RPOH) 3] (ClO 4) 2.nH 2O are characterized as high spin and most of them have an octahedral or distorted octahedral geometry [M = Co(II), Ni(II), or Cu(II); n = 2−5]. The coordination of two P = O groups from one ligand to the metal has been proposed for most of the complexes formed. The coordination of all three P = O groups has been assumed for complexes [M(RPPh) 2](ClO 4) 2.nH 2O and [M(RPOEt) 2](ClO 4) 2.2H 2O.