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Updated: Jul 16, 2026

The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes
Published on: April 10, 2015
Direct observation of the fourth MLCT triplet state in ruthenium(II) tris(2,2'-bipyridine)
Anthony Harriman1, Guillaume Izzet
1Molecular Photonics Laboratory, School of Natural Sciences, University of Newcastle, Bedson Building, Newcastle upon Tyne, UK. Anthony.harriman@ncl.ac.uk
Abstract:
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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