Bis[2-(phenylazo)phenyl-C1N′]gold(III) complexes. Crystal and molecular structure of bis[2-(phenylazo)phenyl-C1N′]gold(III) tetrachloroaurate

Abstract

The reaction between [NMe₄][AuCl₄] and [Hg(pap)₂][pap = 2-(phenylazo)phenyl] gave the gold(III) complex [Au(pap)₂Cl] which reacts with AgClO₄ to form [Au(pap)₂]ClO₄. Addition of [PPh₃(CH₂Ph)]X (X = Cl), NaX (X = Br), or KX (X = l, CN, or O₂CMe), to the cationic complex leads to the corresponding neutral complexes [Au(pap)₂X]. Reaction of [Au(pap)₂]ClO₄ with [NMe₄][AuCl₄], leads to [Au(pap)₂][AuCl₄]. By reacting the neutral acetato-complex with [Hpy]ClO₄(Hpy = pyridinium), [Au(pap)₂(py)]ClO₄ is prepared. The crystal structure of [Au(pap)₂][AuCl₄] has been determined and shows that the cation has a square-planar co-ordination with two cis-nitrogen [Au–N = 2.17(2)Å(av.)] and two cis-carbon [Au–C = 2.00(2)Å(av.)] atoms bonded to gold.