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Ground and excited state communication within a ruthenium containing benzimidazole metallopolymer
Date
2011
Abstract
Emission spectroscopy and electrochemistry has been used to probe the electronic communication between adjacent metal centres and the conjugated backbone within a family of imidazole based metallopolymers, [Ru(bpy)2(PPyBBIM)n] 2+, in the ground and excited states, bpy is 2,20 -bipyridyl, PPyBBIM is poly[2-(2-pyridyl)-bibenzimidazole] and n = 3, 10 or 20. Electronic communication in the excited state is not efficient and upon optical excitation dual emission is observed, i.e., both the polymer backbone and the metal centres emit. Coupling the ruthenium moiety to the imidazole backbone results in a red shift of approximately 50 nm in the emission spectrum. Luminescent lifetimes of up to 120 ns were also recorded. Cyclic voltammetry was also utilized to illustrate the distance dependence of the electron hopping rates between adjacent metal centres with ground state communication reduced by up to an order of magnitude compared to previously reported results when the metal to backbone ratio was not altered. DCT and De values of up to 3.96 1010 and 5.32 1010 cm2 S1 were observed with corresponding conductivity values of up to 2.34 108 S cm1 .
Supervisor
Description
Publisher
Royal Society of Chemistry
Citation
Physical Chemistry Chemical Physics, 2011, 13, pp. 7095–7101
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OReilly_2011_Ground.pdf
Adobe PDF, 251.79 KB
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Funding Information
The financial support of Science Foundation Ireland under the Biomedical Diagnostics Institute (Award No. 03/IN3/B402) is deeply appreciated. LD appreciates funding support from the Marie Curie Reintegration Grant (PIRG-2010-268236).