Syntheses, structures, some reactions, and electrochemical oxidation of ferrocenylethynyl complexes of iron, ruthenium, and osmium

Abstract

The syntheses and characterizations of several complexes containing ferrocenylethynyl and ferrocene-1,1′-bis(ethynyl) groups attached to M(PP)Cp′ [M = Fe, Ru, PP = dppe, Cp′ = Cp*; M = Ru, Os, PP = (PPh 3) 2, dppe, Cp′ = Cp] are described. Reactions with tetracyanoethene have given either tetracyanobuta-1,3-dienyl or η 3-allylic derivatives, while addition of Me + afforded the corresponding vinylidene derivatives. Some electrochemical measurements are discussed in terms of electronic communication between the redox-active M(PP)-Cp′ groups through the ferrocene nucleus. The molecular structures of 14 of these complexes have been determined by crystallographic methods. © 2005 American Chemical Society.