O'Reilly, Emmet J and Dennany, Lynn and Griffith, Darren and Moser, Francois and Keyes, Tia E and Forster, Robert J (2011) Ground and excited state communication within a ruthenium containing benzimidazole metallopolymer. Physical Chemistry Chemical Physics, 13 (15). pp. 7095-7101. ISSN 1463-9076
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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 metallopolymer, [Ru(bpy)2(PPyBBIM)n]2+, in the ground and excited states, bpy is 2,2’-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 x 10-10 and 5.32 x 10-10 cm2S-1 were observed with corresponding conductivity values of up to 2.34 x 10-8 Scm-1.
|Notes:||I am not sure if the following needs to be put in:- Acknowledgements 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).|
|Keywords:||excited state communication , ruthenium , benzimidazole metallopolymer, Physical and theoretical chemistry, Physics and Astronomy(all), Physical and Theoretical Chemistry|
|Subjects:||Science > Chemistry > Physical and theoretical chemistry|
|Department:||Faculty of Science > Pure and Applied Chemistry|
|Depositing user:||Pure Administrator|
|Date Deposited:||15 Jun 2011 09:24|
|Last modified:||15 Apr 2015 11:01|
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