Synthesis, X-ray crystallography, spectroscopic characterization and spectroscopic/electrochemical evidence of formation of phenoxy free radical in active center analogs of galactose oxidase – [Cu(Salgly)H2O] and [Cu(Salphenylalanine)H2O]
作者:Biva Das、Okhil K. Medhi
DOI:10.1016/j.saa.2012.11.041
日期:2013.3
The formation of phenolate free radical is the factor of high turnover for catalytic activity of galactose oxidase (GO) compared to that by inorganic complexes. A new active center analog of GO, [Cu(II)(Salphenylalanine)H2O] have been synthesized and its single crystal X-ray analysis was done. In aqueous surfactant micellar solution chemical oxidation as well as electrochemical oxidation of structural models of galactose oxidase - [Cu(II)Salgly center dot H2O] and [Cu(II)(Salphenylalanine)center dot H2O], have been found to generate free radical originating at the phenolate group. Formation of the free radical have been proved by electron paramagnetic resonance spectroscopy, electronic spectroscopy and electrochemistry. (C) 2012 Elsevier B.V. All rights reserved.