Title

Dimeric ruthenium complexes of dicyanopyrazines: complexes with an unstable mixed-valence state

Document Type

Article

Date of Original Version

1-1-1992

Abstract

Pentaammineruthenium complexes bridged by 2,3-dicyanopyrazine and 2,3-dicyano-5, 6-dimethylpyrazine have been prepared and characterized. The bridging ligand binds to the metal atoms through the cyano nitrogen. Complexes can be prepared in the +4 and +6 oxidation states but the mixed-valence, +5, state is not observed experimentally, unlike the previously prepared 1,2-dicyanobenzene dimer which does have a stable +5 state. A simple electronic model is constructed from the spectroscopic data and is used to show that the electronic perturbations caused by the uncomplexed nitrogen atoms in the pyrazine ring are sufficient to drive the disproportionation reaction of the +5 state. © 1992.

Publication Title

Polyhedron

Volume

11

Issue

24

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