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| - Ru-σ-butadiynyl Complexes of theTetraanilinopyridinatodiruthenium Core: Formation ofa Bis-adduct
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| - The reaction between Ru2(ap)4Cl and excess LiC⋮CC⋮CSiMe3 results in both the mono-butadiynyl adduct Ru2(ap)4(C⋮CC⋮CSiMe3) (1) and the unsymmetric bis-butadiynyl adduct trans-Ru2(ap)4(C⋮CC⋮CSiMe3)2 (2).
- The stoichiometric reaction between Ru2(ap)4Cl (ap = 2-anilinopyridinate) and LiC⋮CC⋮CSiMe3 yielded Ru2(ap)4(C⋮CC⋮CSiMe3) (1) as the only product. A similar reaction utilizinga 5-fold excess of LiC⋮CC⋮CSiMe3 resulted in a mixture of 1 and the bis-alkynyl adducttrans-Ru2(ap)4(C⋮CC⋮CSiMe3)2 (2), and the ratio of two products depends on workupprocedures. X-ray diffraction studies of 1 and 2 revealed that the bridging ap ligands are inthe (4,0) polar arrangement and the Ru−Ru vector and butadiynyl backbone are approximately collinear. Both compounds 1 and 2 are rich in redox chemistry: two reversibleone-electron couples were observed for the former and three for the latter from the cyclicvoltammetry study.
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