Rigid rod σ-acetylide complexes of iron, ruthenium and osmium

Abstract

The synthetic utility of bis(trimethylstannyl)alkynyls in the preparation of Group 8 metal (Fe 2+, Ru 2+, Os 2+) σ-acetylide monomeric, M(DEPE) 2(CCC 6H 5) 2 (M  Fe 2+, Ru 2+; DEPE = 1,2-bis(diethylphosphino)ethane), Ru(DPPE) 2 (CCC 6H 5) 2 (DPPE = 1,2-bis(diphenylphosphino)ethane), Os(DPPM) 2(CCC 6H 5) 2 (DPPM = 1,2-bis(diphenylphosphino)methane) and polymeric, [M(DEPE) 2CCRCC] n (M  Fe 2+, Ru 2+), [Os(DPPM) 2CCRCC-] n (R = p-C 6H 4- C 6H 4- p, p-C 6H 4, p-C 6H 2(CH 3) 2) complexes is demonstrated. The linear arrangement of the acetylenic units around octahedral metal centres is confirmed by a single crystal X-ray structure determination of the model complex trans-[Ru(DPPE) 2(CCC 6H 5) 2].