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Photophysical investigation of the triplet manifold of mono- and bis-phenylethynyl-(2,2′:6′,2″-terpyridine) ruthenium(II) complexes

Lookup NU author(s): Professor Andrew Benniston, Glen Chapman, Emeritus Professor Anthony Harriman, Craig Sams

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Abstract

A complete photophysical study has been carried out on an octahedral ruthenium(II) complex, incorporating two 4′-phenylethynyl-2,2′: 6′,2″-terpyridine ligands. Weak emission is observed from the complex in fluid solution at room temperature, but both emission yield and lifetime increase as the temperature is lowered. Luminescence is confirmed to occur exclusively from the lowest energy triplet metal-to-ligand, charge-transfer (MLCT) state, though higher-lying MLCT and metal-centered states are required to adequately model the non-radiative decay kinetics. A comparison of parameters associated with deactivation of the complex and its counterpart, where only one terpy ligand incorporates the phenylethynyl unit, indicates that only the electron-vibrational coupling element is affected. It is also revealed that the extent of electron delocalisation at the triplet level does not critically depend on the number of 4-phenylethynyl-2,2′:6′,2″- terpyridine ligands in the complex. © 2005 Elsevier B.V. All rights reserved.

Publication metadata

Author(s): Benniston AC, Chapman GM, Harriman A, Sams CA

Publication type: Article

Publication status: Published

Journal: Inorganica Chimica Acta

Year: 2006

Volume: 359

Issue: 3

Pages: 753-758

ISSN (print): 0020-1693

ISSN (electronic): 1873-3255

Publisher: Elsevier BV

URL: http://dx.doi.org/10.1016/j.ica.2005.03.046

DOI: 10.1016/j.ica.2005.03.046

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