New molecular architectures containing low-valent cluster centres with di- and trimetalated 2-vinylpyrazine ligands: synthesis and molecular structures of Ru₅(CO)₁₅(μ₅-C₄H₂N₂CHCH)(μ-H)₂ and Ru₈(CO)₂₄(μ₇-C₄H₂N₂CHC)(μ-H)₃
2019
Hossain, Md Monir | Akter, Nahid | Ghosh, Shishir | Nesterov, Vladimir N. | Richmond, Michael G. | Hogarth, Graeme | Kabir, Shariff E.
Reaction of 2-vinylpyrazine with Ru₃(CO)₁₂ results in multiple C–H bond activations to afford penta- and octa-ruthenium clusters, Ru₅(CO)₁₅(μ₅-C₄H₂N₂CHCH)(μ-H)₂ (2) and Ru₈(CO)₂₄(μ₇-C₄H₂N₂CHC)(μ-H)₃ (3), in which a Ru₃ sub-unit is linked to Ru₂ and Ru₅ centres via di- and tri-metalated 2-vinylpyrazine ligands, exhibiting novel coordination modes including the loss of ring aromaticity in 2. The bonding of 2 and the mechanism for the fluxional behaviour of the hydrides have been examined by electronic structure calculations.
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