Solvent and pH effects on the redox behavior and catecholase activity of a dicopper complex with distant metal centers.
A dicopper complex is described for which significant catecholase activity was found, particularly for a compound in which the two metal ions are more than 7A apart. Variations on the catecholase activity of this complex were explored in a range of pH values from 5.5 to 9.0 in two solvent mixtures, MeCN/H(2)O and MeOH/H(2)O. The catalytic performance of the complex was found to be substantially better in the second, where the maximum activity was achieved at a pH value one unit lower than in the first. Electrochemical studies of the complex in the absence and presence of dioxygen revealed a very different behavior in each of the two solvent mixtures, which may account for the correspondingly distinct catalytic activity.
González-Sebastián
Lucero
L
Facultad de Química, Departamento de Química Inorgánica y Nuclear, Universidad Nacional Autónoma de México, México, DF, México.
Ugalde-Saldívar
Víctor Manuel
VM
Mijangos
Edgar
E
Mendoza-Quijano
María Rosa
MR
Ortiz-Frade
Luis
L
Gasque
Laura
L
D002384:Catalysis; D004156:Catechol Oxidase / Q000737:chemistry* / Q000378:metabolism; D002396:Catechols / Q000378:metabolism; D003300:Copper / Q000737:chemistry*; D055664:Electrochemical Techniques; D004578:Electron Spin Resonance Spectroscopy; D006575:Heterocyclic Compounds, 3-Ring / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008956:Models, Chemical; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000737:chemistry* / Q000378:metabolism; D010084:Oxidation-Reduction; D010100:Oxygen / Q000737:chemistry / Q000378:metabolism; D012997:Solvents; D014961:X-Ray Diffraction
D002396:Catechols; D006575:Heterocyclic Compounds, 3-Ring; D009942:Organometallic Compounds; D012997:Solvents; C530403:dimeim; D003300:Copper; D004156:Catechol Oxidase; C034221:catechol; D010100:Oxygen