Original scientific paper

Phenylcyanamidocopper(I) and Silver(I) Complexes: Synthetic and Structural Studies

Eric W. Ainscough ; Chemistry – Institute of Fundamental Sciences, Massey University, Palmerston North, New Zealand
Andrew M. Brodie ; Chemistry – Institute of Fundamental Sciences, Massey University, Palmerston North, New Zealand
Roger J. Cresswell ; Chemistry – Institute of Fundamental Sciences, Massey University, Palmerston North, New Zealand
Jocelyn C. Turnbull ; Chemistry – Institute of Fundamental Sciences, Massey University, Palmerston North, New Zealand
Joyce M. Waters ; Chemistry – Institute of Fundamental Sciences, Massey University, Palmerston North, New Zealand

Abstract

Phenylcyanamidocopper(I) and silver(I) complexes of the type, [{M(PPh₃)₂L}₂] (M = Cu, L = 4-NO₂pcyd or 4-Me₂Npcyd; M = Ag, L = 4-Me₂Npcyd), [Cu(PPh₃)₃L] (L = pcyd or 4-NO₂-pcyd), [Ag-(PPh₃)₃L] (L = pcyd, 2-Clpcyd, 4-Clpcyd, 4-Brpcyd, 4-MeOpcyd, 4-NO₂pcyd or 4-Me₂Npcyd), [Ag(Me₂phen)(2-Clpcyd)] (Me₂phen = 2,9-dimethyl-1,10-phenanthroline) and [Ag(dppm)(4-Brpcyd)] (dppm = bis(diphenylphosphino)methane) have been synthesised and characterised and the crystal structures of four of the complexes determined. For both [{Cu(PPh₃)₂(4-Me₂Npcyd)}₂] ⋅ CH₂Cl₂ and [{Ag(PPh3)2(4-Me2Npcyd)}2], the cyanamide ligands bridge the metal atoms in a μ-1,3-fashion through the cyano and amido nitrogens. Each metal atom has a distorted tetrahedral geometry, being bound to two triphenylphosphine phosphorus atoms and two nitro-gen atoms from 4-Me2Npcyd ligands to give a 'P₂N₂' coordination sphere. In the case of the Cu complex the dimer is centrosymmetric but for the Ag complex the metal atoms are not equivalent. The complexes, [Ag(PPh₃)₃(4-Brpcyd)] and [Ag(PPh₃)₃(4-Me-Opcyd)], are discrete monomers, in which each of the Ag atoms adopts a distorted tetrahedral geometry, being bound to three triphenylphosphine phosphorus atoms and one phenylcyanamide ligand binding in a terminal fashion through the cyano nitrogen.

Keywords

phenylcyanamide; copper(I); silver(I); X-ray structures

Hrčak ID:

132179

URI

https://hrcak.srce.hr/132179

Publication date:

1.9.1999.

Visits: 886 *