Collect. Czech. Chem. Commun. 1988, 53, 3080-3088

An ESR study of irradiated mixtures of hydrogen peroxide and Cu(II) complexes at 77 K

Pavel Stopka

Institute of Inorganic Chemistry, Czechoslovak Academy of Sciences, 160 00 Prague 6


When aqueous solutions containing hydrogen peroxide and CuSO4 are irradiated by a high-pressure mercury lamp at room temperature and at 77 K, hydrogen peroxide decomposes and hydroxyl radicals generated in high concentrations coordinate to CuSO4. The catalytic activity of Cu(II), which depends on the choice of the ligand (triene, diene, ethylenediamine, ammonia, EDTA, oxalic acid and glycerine) and the proportion between the monomeric and dimeric forms of the Cu(II) complex, shows a maximum at a concentration of 10-4 mol dm-3. The catalytically active species is the monomeric Cu(II) complex, the dimer being inactive.