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Title

How useful are vibrational frequencies of isotopomeric O2 fragments for assessing local symmetry? Some simple systems and the vexing case of a galactose oxidase model

Authors
Kinsinger, Christopher R.
Gherman, Benjamin F.
Cramer, Christopher J.
Published in Journal of Biological Inorganic Chemistry. 2005, vol. 10, no. 7, p. 778-789
Abstract The tendency for mixed-isotope O2 fragments to exhibit different stretching frequencies in asymmetric environments is examined with various levels of electronic structure theory for simple peroxides and peroxyl radicals, as well as for a variety of monocopper–O2 complexes. The study of the monocopper species is motivated by their relevance to the active site of galactose oxidase. Extensive theoretical work with an experimental model characterized by Jazdzewski et al. (J. Biol. Inorg. Chem. 8:381–393, 2003) suggests that the failure to observe a splitting between 16O18Oand 18O16O isotopomers cannot be taken as evidence against end-on O2 coordination. Conformational analysis on an energetic basis, however, is complicated by biradical character inherent in all of the copper–O2 singlet structures.
Keywords Copper superoxideCopper peroxideRaman spectroscopyGalactose oxidaseDensity functional theory
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Research group Groupe Gagliardi
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KINSINGER, Christopher R. et al. How useful are vibrational frequencies of isotopomeric O2 fragments for assessing local symmetry? Some simple systems and the vexing case of a galactose oxidase model. In: Journal of Biological Inorganic Chemistry, 2005, vol. 10, n° 7, p. 778-789. https://archive-ouverte.unige.ch/unige:3651

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Deposited on : 2009-10-02

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