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Molecular Photonics Laboratory, School of Natural Sciences, University of Newcastle, Bedson Building, Newcastle upon Tyne, UK
; Fax: +44 191 222 8660
; Tel: +44 191 222 8660
Phys. Chem. Chem. Phys., 2007,9, 944-948
22 Sep 2006,
07 Dec 2006
First published online
11 Jan 2007
The luminescence properties of ruthenium(II) tris(2,2′-bipyridine) have been recorded in butyronitrile solution and in a transparent KBr disk over a reasonable temperature range. In solution, spectral curve fitting routines indicate that emission arises solely from an ensemble of triplet states, each of which is of Metal-to-Ligand, Charge-Transfer (MLCT) character and of closely comparable energy. At ambient temperature, dual emission is observed for the KBr disk and interpreted in terms of luminescence from both the ensemble and the fourth MLCT triplet state that lies at slightly higher energy. Relative reorganisation energies, energies, Huang–Rhys factors and radiative rate constants have been calculated for the two emissive states. It is confirmed that the fourth MLCT triplet state possesses more singlet character than the ensemble.
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