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Dalton Transactions

The international journal for inorganic, organometallic and bioinorganic chemistry



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Dalton Trans., 2004, 3943 - 3949, DOI: 10.1039/b409189b

Assessment of intercomponent interaction in phenylene bridged dinuclear ruthenium(II) and osmium(II) polypyridyl complexes

Adrian L. Guckian, Manfred Doering, Michael Ciesielski, Olaf Walter, Johan Hjelm, Noel M. O'Boyle, William Henry, Wesley R. Browne, John J. McGarvey and Johannes G. Vos

The synthesis and characterisation of [Ru(bipy)2(L1)]2+ and the homodinuclear complexes [M(bipy)2(L1)M(bipy)2]4+(where M = Ru or Os), employing the ditopic ligand, 1,4-phenylene-bis(1-pyridin-2-ylimidazo[1,5-a]pyridine)(L1), are reported. The complexes are identified by elemental analysis, UV/Vis, emission, resonance Raman, transient resonance Raman and 1H NMR spectroscopy, mass spectrometry and electrochemistry. The X-ray structure of the complex [Ru(bipy)2(L1)(bipy)2Ru](PF6)4 is also reported. DFT calculations, carried out to model the electronic properties of the compounds, are in good agreement with experiment. Minimal communication between the metal centres is observed. The low level of ground state electronic interaction is rationalized in terms of the poor ability of the phenyl spacer in facilitating superexchange interactions. Using the electronic and electrochemical data a detailed picture of the electronic properties of the RuRu compound is presented.

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