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Both the { mono} - and { bis} -alkynyl adducts on a diruthenium core supported by either diarylformamidinate, or 2-anilinopyridinate, or dimethylbenz amidinate have been synthesized and characterized. These novel Ru 2 -metallaynes are highly redox flexible, soluble in common organic solvents and stable towards air, moisture and heat. Electrochemical and spectroscopic studies revealed that the Ru 2 -metallaynes have exceptionally small solution HOMO-LUMO gaps (1.2-1.4 eV) and high electron affinities. Ru 2 -metallaynes can be oxidatively coupled at ≡C-H termini, and the resultant dimers exhibit an extensive electronic delocalization across the polyyne-diyl (-C 2m -) bridge. Study of a bis-(1-ferrocenylethynyl)-adduct revealed that the Ru 2 core facilitates electron transfer between two Fc termini.
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Ren et al. (2002) studied this question.
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