Ethynylcobaltocenium compounds as precursors for bridged, heteronuclear oligometallocenes

摘要: Abstract A general procedure for introducing substituents into cationic sandwich complexes by nucleophilic attack of suitable carbanions and subsequent hydride abstraction has been applied to the preparation ethynyl-substituted cobaltocene species. Ethynylcobaltocenium hexafluorophosphate, trimethylsilylethynylcobaltocenium salts ferrocenylethynylcobaltocenium, a rigidly-bridged, conjugated heteronuclear bimetallocene, have prepared. These compounds isolated exo-diene intermediates characterized NMR IR spectroscopy, mass spectrometry cyclic voltammetry. The new two-centered cation ferrocenylethynylcobaltocenium exhibits diamagnetism, indicating situation not involving asymmetric averaging formal oxidation states on time scale. electrochemical potentials halfwave separations fall within expected ranges.