Synthesis and reactivity of dibenzometallole complexes of gold(III) and platinum(II)

Abstract

Gold(II) and platinum(II) metallacycles, [(C 12H 8)AuCl] n , [(C 12H 8)AuX 2] − and [(C 12H 8)Pt(COD)] can be prepared by treating [AuCl 3(tht)], [AuX 4] − or [PtCl 2(COD)] with (C 12H 8)Sn-n-Pr 2 (C 12H 8 = 2.2′-biphenyl, COD = 1,5-cyclooctadiene, tht = tetrahydrothiophen). The reaction of [(C 12H 8)AuCl] n with neutral monodentate ligands L (L =, PPh − 3, py or tht) or bidentate Iigands LL (LL = phen or bipy) leads to complexes of the types [(C 12H 8)AuClL] or [(C 12H 8)AuLL] + [(C 12H 8)AuCl 2] −, whilst treatment with anionic ligands (X = CN) gives polynuclear [(C 12H 8)AuX] m or mononuclear species [(C 12H 8)AU(acac)] (X = acac = acetylacetonate), respectively. The bromo ligands of [(C 12H 8)AuBr 2] − can be replaced by other halogens or pseudohalogens (X = I, CN, SCN) to give anionic complexes of the type [(C 12H 8)AuX 2] −. The reactions of [(C 12H 8)Pt(COD)] with neutral monodentate ligands (L = PPh 3 or t-BuNC) lead to complexes of the type [(C 12H 8)PtL 2].