Ground and excited state communication within a ruthenium containing benzimidazole metallopolymer

Literature Information

Publication Date 2011-03-14
DOI 10.1039/C0CP02638G
Impact Factor 3.676
Authors

Emmet J. O'Reilly, Lynn Dennany, Darren Griffith, Francois Moser, Tia E. Keyes, Robert J. Forster


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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 2,2′-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 × 10−10 and 5.32 × 10−10 cm2 S−1 were observed with corresponding conductivity values of up to 2.34 × 10−8 S cm−1.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
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