Photoinduced ligand isomerisation in a pyrazine containing ruthenium polypyridyl complex

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Title: Photoinduced ligand isomerisation in a pyrazine containing ruthenium polypyridyl complex
Authors: Horn, Sabine
Ahmed, Hamid M. Younis
Hughes, Helen P.
Soman, Suraj
Browne, Wesley R.
Vos, Johannes G.
Permanent link: http://hdl.handle.net/10197/2793
Date: 2010
Abstract: Photochemically induced ligand rearrangements for the N2 and N4 coordination isomers of the complex [Ru(bpy)2(Hpztr)]2+ and its deprotonated analogue [Ru(bpy)2(pztr)]+, where bpy is 2,2’-bipyridyl and Hpztr is pyrazine-1,2,4-triazole ligand, are reported. 1H NMR spectroscopic and HPLC studies indicate that in acetone and acetonitrile the complexes are photostable when the triazole ring is deprotonated. Irradiation of the protonated N2 isomer in acetone results in formation of the N4 isomer, with the N4 isomer being photostable. In acetonitrile both isomers show photolability of the triazole based ligand and full dissociation to form [Ru(bpy)2(CH3CN)2]2+ is observed. The activation parameters for the population of the 3MC state from the lowest 3MLCT manifold, as obtained from temperature dependent emission lifetime studies, are reported and their relevance to the observed photochemical behaviour is considered. The results obtained are discussed in relation the analogous pyridine-triazole complexes.
Funding Details: Science Foundation Ireland
Other funder
Type of material: Journal Article
Publisher: RSC publications
Journal: Photochemical & Photobiological Sciences
Volume: 9
Issue: 7
Start page: 985
End page: 990
Copyright (published version): The Royal Society of Chemistry and Owner Societies 2010
Keywords: PhotochemistryRutheniumIsomerTriazole ringDeprotonationPyridine-triazole complexes
Subject LCSH: Photochemistry
Ruthenium
Isomerization
Triazoles
Pyridine
DOI: 10.1039/c0pp00054j
Other versions: http://dx.doi.org/10.1039/c0pp00054j
Language: en
Status of Item: Peer reviewed
Appears in Collections:Solar Energy Conversion (SEC) Cluster Research Collection

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