Electropolymerized films of [Co(v-terpy)2]2+ (v-terpy is 4'-vinyl-2,2':6',2,'-terpyridinyl) exhibit reactivity patterns, especially with regard to ligand exchange, that differ significantly from those exhibited by [Co(terpy)2]2+ in solution. These differences are attributed to the physically constrained environment present in the polymer film. The charge-transport properties follow the model of Dahms and Ruff and the predicted concentration dependence of the diffusion coefficient. These electropolymerized films are also active in the electrocatalytic reduction of carbon dioxide.

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for their continued technical assistance and support. We also thank S. Krzysko at Northeastern University for her able assistance.