Transition metal hydroborate complexes. IV. Cyanotrihydroborate complexes of the group Ib metals

Article abstract of DOI:10.1021/ic50107a002

The synthesis of several copper(I) and silver(I) compounds containing tertiary group V donor ligands and a coordinated cyanotrihydroborate or cyanotriphenylborate anion is reported. Complexes of general formula L₃M(NCBR₃) are shown by physical measurements to contain metal-nitrogen bonds, both in the solid state and in chlorinated hydrocarbon solvents. In acetonitrile solution [(C₆H₅)₃P]₃Cu(NCBH₃) is a weak electrolyte, as determined from conductivity studies. The relative extent of dissociation of hydroborate and chloride ligands from triphenylphosphine-coordinated copper(I) ions in acetonitrile is found to be B₃H₈^- ～ H₃BCN^- > BH₄^- ～ Cl^-. The cyanotrihydroboratotris(triphenylphosphine)silver(I) compound is more highly ionized. From its infrared spectrum, the complex of empirical formula [(C₆H₅)₃P]₂Cu(NCBH₃) is concluded to be a dimer, with bridging cyanotrihydroborate ligands coordinated to form both Cu-NCBH₃ and Cu-HBH₂CN type linkages.