Synthetic, structural, electrochemical and electronic characterisation of heterobimetallic bis(acetylide) ferrocene complexes

Michael C.B. Colbert, Jack Lewis, Nicholas J. Long, Paul R. Raithby, Andrew J.P. White, David J. Williams

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A series of novel heterobimetallic bis(acetylide) ferrocene complexes featuring a bis[1,2-bis(diphenylphosphino)-methane]ruthenium centre and seven variously substituted aromatic acetylene ligands have been synthesised and characterised. The crystal structure of trans-[Ru(dppm)2{C≡C(C5H4)Fe(C 5H5)}2] shows the ruthenium centre in a distorted-octahedral environment bound to two ferrocene units in a linear fashion by 'rigid-rod'-like acetylene linkages. The conformation is stabilised by strong intramolecular CH⋯π(C≡C) interactions. Electrochemical studies showed that incorporation of donor-substituted aromatic acetylide ligands causes a cathodic shift in the RuII/III redox potential. Conversely, an anodic shift is observed when electron-withdrawing substituents are present in the acetylide systems. Electronic spectral measurements indicated that the systems belong to the Robin and Day 'Class II' mixed-valence species and suggest that greater electronic interaction occurs in the bis(acetylide) complexes than in the corresponding monoacetylide chloro-complex.

Original languageEnglish
Pages (from-to)99-104
Number of pages6
JournalJournal of the Chemical Society - Dalton Transactions
Issue number1
Publication statusPublished - 7 Jan 1997

ASJC Scopus subject areas

  • Chemistry(all)

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