New organogold(I) complexes: Synthesis, structure, and dynamic behavior of the polynuclear organogold diphenylmethane and diphenylethane derivatives

• Published in: Journal of organometallic chemistry 1997-03, Vol.530 (1), p.27-38
• Main Authors: Baukova, Tat'yana V., Kuz'mina, Lyudmila G., Oleinikova, Natal'ya A., Lemenovskii, Dmitrii A., Blumenfel'd, Aleksander L.
• Format: Article
• Language: English
• Subjects: Agostic; Crystal structure; Fluxionality; Gold; Phenyl; Phosphine
• ISSN: 0022-328X; 1872-8561
• DOI: 10.1016/S0022-328X(96)06539-4

Two organogold derivatives of diphenylmethane and diphenylethane, Ph 3PAu( o-C 6H 4)CH 2(C 6H 4- o)AuPPh 3 ( 1) and Ph 3PAu( o-C 6H 4)(CH 2) 2(C 6H 4- o)AuPPh 3 ( 2), have been synthesized by the reaction of ClAuPPh 3 with Li( o-C 6H 4)CH 2(C 6H 4- o)Li and Li( o-C 6H 4)(CH 2) 2(C 6H 4- o)Li respectively. The interaction of 1 with dppe results in the replacement of the two PPh 3 groups to give a macrocyclic compound Au( o - C 6 H 4 )C H 2 (C 6 H 4 - o )Au(μ-PP h 2 CH 2 CH 2 P ︹ Ph 2 ) ( 3) that includes an Au ⋯ Au bond. Compounds 1 and 2 react with one or two equivalents of [Ph 3PAu]BF 4 to form new types of cationic complex [CH 2(C 6H 4- o) 2(AuPPh 3) 3]BF 4 ( 4), [CH 2(C 6H 4- o) 2(AuPPh 3) 4](BF 4) 2 ( 5), and [(CH 2) 2(C 6H 4- o) 2(AuPPh 3) 4](BF 4) 2 ( 6). Complexes 1–6 have been characterized by X-ray diffraction studies, FAB MS, and IR as well as by 1H and 31P NMR spectroscopy. A complicated system of Au ⋯ H-C agostic interactions, involving the bridging alkyl groups (—CH 2— and CH 2-CH 2—) of diphenylmethane and diphenylethane ligands, has been found to occur in complexes 1–3 and 6.