Complexes containing the diradical 1,2,3,4-tetraphenylbuta-1,3-diene-1,4-diyl; crystal structure of [AuCl(C4Ph4)(phen)]

Abstract

The reaction between [{AuCl(C₄Ph₄)}₂](C₄Ph₄= 1,2,3,4-tetraphenylbuta-1,3-diene-1,4,diyl) or [AuCl(C₄Ph₄)(tht)] and neutral unidentate ligands L gives rise to bridge cleavage or to displacement of the tetrahydrothiophen ligand (tht) yielding neutral complexes of the type [AuCl(C₄Ph₄)L][L = pyridine, PPh₃, P(C₆H₁₁)₃, or CNBu^t]. The reaction of the dimeric complex with NEt₄Cl leads to the anionic complex [NEt₄][AuCl₂(C₄Ph₄)]. The use of bidentate ligands allows the preparation of two different types of complexes : [Au(C₄Ph₄)(L–L)][AuCl₂(C₄Ph₄)][L–L = 2,2′-bipyridine (bipy), 1,10-phenanthroline (phen), or Ph₂P(CH₂)₂PPh₂(dppe)] and [AuCl(C₄Ph₄)(L–L)][L–L = phen or 2,2′-biquinolyl (bquin)]. Preparations of the probably non-heterocyclic [Pd₂Cl₂(C₄Ph₄)(bipy)₂] and two gold(I) complexes [Au₂(C₄Ph₄)(PPh₃)₂] and [Au₂(C₄Ph₄)(dppe)] are also described. The crystal structure of [AuCl(C₄Ph₄)(phen)] has been determined : space group P, a= 11.040(2), b= 12.283(2), c= 13.670(3)Å, α= 99.76(2), β= 113.58(2), γ= 101.94(2)°, R= 0.030. Distorted five-co-ordination is observed [Au–N 2.184(4) and 2.755(4)Å].