New molecular architectures containing low-valent cluster centres with di- and trimetalated 2-vinylpyrazine ligands: synthesis and molecular structures of Ru5(CO)15(μ5-C4H2N2CH=CH)(μ-H)2 and Ru8(CO)24(μ7-C4H2N2CH=C)(μ-H)3

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-C4H2N2CH=CH)(μ-H)2 (2) and Ru8(CO)24(μ7-C4H2N2CH=C)(μ-H)3 (3), in which a Ru3 sub-unit is linked to Ru2 and Ru5 centres via di- and tri-metalated 2-vinylpyra...

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Bibliographic Details
Published in:RSC advances 2019-07, Vol.9 (36), p.21025-21030
Main Authors: Md Monir Hossain, Akter, Nahid, Ghosh, Shishir, Nesterov, Vladimir N, Richmond, Michael G, Hogarth, Graeme, Kabir, Shariff E
Format: Article
Language:English
Subjects:
Aromaticity
Chemical synthesis
Chemistry
Crystallography
Electronic structure
Hydrogen bonds
Ligands
Ruthenium
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Summary: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-C4H2N2CH=CH)(μ-H)2 (2) and Ru8(CO)24(μ7-C4H2N2CH=C)(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.
ISSN:2046-2069
DOI:10.1039/c9ra03841h