The electrochemical characterisation of films formed by co-polymerisation of [Os(2,2'-bipyridin)(2)XCl] (Os-PMP) where X is 3-(pyrrole-lyl-methyl)pyridine with 3-methyl thiophene or 1,2-diaminobenzene was carried out. The use of the membrane template method, which allowed growth of tubules of redox co-polymer was employed in the case of 1,2-diaminobenzene. Cyclic voltammetry allowed formation of the most stable 3-methylthiophene/Os-PMP films while chronocoulometry was used to co-polymerise Os-PMP with 1,2-diaminobenzene, resulting in stable films of co-polymer micro-tubules with thin-film behaviour up to 0.5 V s(-1) (r(2) = 0.9997). Surface analysis was carried out using SEM. (c) 2008 Elsevier Ltd. All rights reserved.