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A modular approach to luminescent dinuclear ruthenium(II) and rhenium(I) complexes

Research output: Contribution to journalJournal article

Published
<mark>Journal publication date</mark>08/2008
<mark>Journal</mark>European Journal of Inorganic Chemistry
Issue number23
Volume2008
Number of pages9
Pages (from-to)3597-3605
Publication StatusPublished
<mark>Original language</mark>English

Abstract

A series of dinuclear (bipyridine)tricarbonylrhenium(I) and tris(bipyridine) ruthenium(II) complexes have been isolated and characterised, bridged by a flexible diamido ethylene glycol chain. A new stepwise synthetic pathway has been investigated to heterometallic complexes, with the rhenium(I) complexes exhibiting an unusual configuration and inequivalence of the metal centres potentially arising from a surprising hydrogen-bonding interaction between an Re-CO group and an amide proton in low-polarity solvents. This interaction appears to be broken by competing hydrogen-bonding species such as dihydrogen phosphate. This effect was not observed in file corresponding ruthenium(II) complexes, which showed very little interaction with anions. The photophysical characterisation shows that the inclusion Of two ester/amide groups to the rhenium centre effectively quenches the fluorescence at. room temperature, The ruthenium(II) complexes have considerably stronger fluorescence than the rhenium species, and are less affected by the inclusion of ester and amide groups to the 2,2'-bipyridine chelating group, ((D Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheirn, Germany, 2008).