Thus, pyrolysis of Cu II complexes with DAB and Phen lead to formation of metallic Cu, apparently due to reduction of Cu II with organic ligand or the products of its decomposition. In some cases, the quantity of the organic ligand was, probably, insufficient for complete reduction of all Cu II , and in such cases CuCl or Cu2O formed (proving this supposition requires detailed studies of the pyrolysis mechanism and evaluation of the balance between Cu II and available reducers, which are different in the cases of Phen and DAB. This task was out of the scope of this study). Anyhow, the presence of Cu2O or remaining CuCl did not apparently affect the catalytic activity of the composites.