title: Catalytic activity for decomposition of hydrogen peroxide by metal complexes of water-soluble thiacalix[4]arenetetrasulfonate on the modified anion-exchangers.
abstract: The catalytic activity for the decomposition of hydrogen peroxide by anion-exchangers modified with metal complexes of thiacalix[4]arenetetrasulfonate (Me(n+)-TCAS[4], Me(n+)=Mn(3+), Mn(2+), Fe(3+), Co(3+), Co(2+), Cu(2+), Zn(2+) and Ni(2+)) was investigated. As a reference, calix[4]arenetetrasulfonate, calix[6]arenehexasulfonate and calix[8]areneoctasulfonate were also examined. Mn(3+)- and Fe(3+)-TCAS[4] on the modified anion-exchangers showed high catalytic activity in alkaline buffer solutions among metal complexes tested. Mn(3+)- and Fe(3+)-TCAS[4] on the modified anion-exchangers exhibited high and constant levels of catalytic activity even after having been used 5 times, and showed catalytic activity in the presence of an excess of H(2)O(2) over Mn(3+)- and Fe(3+)-TCAS[4] on the modified anion-exchangers. Only Mn(3+)-TCAS[4] on the modified anion-exchangers exhibited high catalytic activity at around a neutral pH.
authors.affiliation: Faculty of Science, Okayama University of Science, Okayama, Japan. odo@dbc.ous.ac.jp
authors.forename: Junichi
authors.initials: J
authors.lastname: Odo
authors.forename: Hanae
authors.initials: H
authors.lastname: Yamaguchi
authors.forename: Hirotaka
authors.initials: H
authors.lastname: Ohsaki
authors.forename: Noriyoshi
authors.initials: N
authors.lastname: Ohmura
mesh_terms: D000837:Anion Exchange Resins / Q000737:chemistry*; D002384:Catalysis; D006861:Hydrogen Peroxide / Q000737:chemistry*; D019216:Metals, Heavy / Q000737:chemistry*; D015394:Molecular Structure; D010636:Phenols / Q000737:chemistry*
chemical_list: D000837:Anion Exchange Resins; D019216:Metals, Heavy; D010636:Phenols; C446239:thiacalix(4)arenetetrasulfonate; D006861:Hydrogen Peroxide