Catalytic behavior of some copper(II) complexes with mixed ligands in the decomposition of hydrogen peroxide |
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| Institution: | 1. Advanced Materials Group, Materials Sciences and Technology Division, CSIR-North East Institute of Science and Technology, Jorhat 785006, Assam, India;2. Academy of Scientific and Innovative Research, CSIR-NEIST Campus, India;3. Univ. Lille1, CNRS, Centrale Lille, ISEN, Univ. Valenciennes, UMR 8520 − IEMN, F-59000 Lille, France;1. Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, PR China;2. The United Innovation of Mengchao Hepatobiliary Technology Key Laboratory of Fujian Province, Mengchao Hepatobiliary Hospital of Fujian Medical University, Fuzhou 350025, PR China;3. Department of Translational Medicine, Xiamen Institute of Rare Earth Materials, Chinese Academy of Sciences, Xiamen 361024, PR China;4. College of Engineering and Computer Science, The Australian National University, Canberra 2601, Australia;5. Key Laboratory of Biomedical Engineering of Fujian Province & Research Center of Biomedical Engineering of Xiamen, Department of Biomaterials, Xiamen University, Xiamen 361005, PR China;1. College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou, Zhejiang, 310058, PR China;2. Zhejiang A&F University, Hangzhou, Zhejiang, 311300, PR China;1. Departamento de Ingeniería de Procesos e Hidráulica, Universidad Autónoma Metropolitana-Iztapalapa, Apartado Postal 55-534, 09340, México City, Mexico;2. Instituto Politécnico Nacional, CEPROBI, Km 6 Carr. Yautepec-Jojutla, Calle Ceprobi No. 8, Apartado Postal 24, Yautepec, 62731, Mexico;3. Facultad de Ciencias, Universidad Autónoma del Estado de México, Campus El Cerrillo, Toluca, 50200, Mexico;1. Catalysis and Synthesis Research Group, Focus Area: Chemical Resource Beneficiation, North-West University, Hoffman Street, Potchefstroom 2531, South Africa;2. Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, PO Wits, 2050, South Africa |
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| Abstract: | A comparative study of the catalyzed decomposition of hydrogen peroxide using the following copper(II) complex salts, Cu(bipy)(S-threo)Cl · 3H2O, Cu(phen)(S-threo)Cl · 2H2O, Cu(bipy)(S-prol)Cl · 2H2O and Cu(phen)(S-prol)Cl · 2H2O has been made. Kinetic parameters were experimentally determined by the polarographic method at 25°C, pH 7.7 and constant ionic strength (μ = 0.1 M NaNO3). The catalytic behavior of the chelate with 2,2′-bipyridine and S-prolinate was also studied at pH 6.5 and 8.5. The reactivity follows the sequence: Cu(bipy)S-prol] > Cu(phen)S-prol] > Cu(bipy)S-threo] > Cu(phen)S-threo]. Activation energies are very similar to each other. The pH-dependent exchange of the amino acid ligand with hydrogen peroxide seems to be a critical factor in the reaction pathway. Several reaction mechanisms are proposed. |
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