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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[double bond, length as m-dash]CH)(μ-H)2 and Ru8(CO)24(μ7-C4H2N2CH[double bond, length as m-dash]C)(μ-H)3.

ABSTRACT: 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[double bond, length as m-dash]CH)(μ-H)2 (2) and Ru8(CO)24(μ7-C4H2N2CH[double bond, length as m-dash]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.

SUBMITTER: Hossain MM 

PROVIDER: S-EPMC9066017 | biostudies-literature | 2019 Jul

REPOSITORIES: biostudies-literature

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New molecular architectures containing low-valent cluster centres with di- and trimetalated 2-vinylpyrazine ligands: synthesis and molecular structures of Ru<sub>5</sub>(CO)<sub>15</sub>(μ<sub>5</sub>-C<sub>4</sub>H<sub>2</sub>N<sub>2</sub>CH[double bond, length as m-dash]CH)(μ-H)<sub>2</sub> and Ru<sub>8</sub>(CO)<sub>24</sub>(μ<sub>7</sub>-C<sub>4</sub>H<sub>2</sub>N<sub>2</sub>CH[double bond, length as m-dash]C)(μ-H)<sub>3</sub>.

Hossain Md Monir MM   Akter Nahid N   Ghosh Shishir S   Nesterov Vladimir N VN   Richmond Michael G MG   Hogarth Graeme G   Kabir Shariff E SE  

RSC advances 20190704 36

Reaction of 2-vinylpyrazine with Ru<sub>3</sub>(CO)<sub>12</sub> results in multiple C-H bond activations to afford penta- and octa-ruthenium clusters, Ru<sub>5</sub>(CO)<sub>15</sub>(μ<sub>5</sub>-C<sub>4</sub>H<sub>2</sub>N<sub>2</sub>CH[double bond, length as m-dash]CH)(μ-H)<sub>2</sub> (2) and Ru<sub>8</sub>(CO)<sub>24</sub>(μ<sub>7</sub>-C<sub>4</sub>H<sub>2</sub>N<sub>2</sub>CH[double bond, length as m-dash]C)(μ-H)<sub>3</sub> (3), in which a Ru<sub>3</sub> sub-unit is linked to Ru<sub>2</  ...[more]

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