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.
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
|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:||Photochemistry; Ruthenium; Isomer; Triazole ring; Deprotonation; Pyridine-triazole complexes||Subject LCSH:||Photochemistry
|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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