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Chromium(v)-oxo and chromium(iii)-superoxo complexes bearing a macrocyclic TMC ligand in hydrogen atom abstraction reactions

Title
Chromium(v)-oxo and chromium(iii)-superoxo complexes bearing a macrocyclic TMC ligand in hydrogen atom abstraction reactions
Authors
Cho J.Woo J.Eun Han J.Kubo M.Ogura T.Nam W.
Ewha Authors
남원우조재흥
SCOPUS Author ID
남원우scopus
Issue Date
2011
Journal Title
Chemical Science
ISSN
2041-6520JCR Link
Citation
vol. 2, no. 10, pp. 2057 - 2062
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
A Cr(v)-oxo complex bearing a macrocyclic TMC ligand, [Cr V(TMC)(O)(OCH 3)] 2+, was synthesized, isolated, and characterized by various physicochemical methods, including UV-vis, ESI-MS, resonance Raman, EPR and X-ray analysis. The reactivity of the Cr(v)-oxo complex was investigated in C-H and O-H bond activation reactions. The reactivity of a Cr(iii)-superoxo complex, [Cr III(TMC)(O 2)(Cl)] +, was investigated in O-H bond activation reactions as well. By comparing reactivities of the Cr(iii)-superoxo and Cr(v)-oxo complexes under the identical reaction conditions, we were able to demonstrate that the Cr(iii)-superoxo complex is more reactive than the Cr(v)-oxo complex in the activation of C-H and O-H bonds. The present results provide strong evidence that under certain circumstances, metal-superoxo species can be an alternative oxidant for high-valent metal-oxo complexes in oxygenation reactions. © The Royal Society of Chemistry 2011.
DOI
10.1039/c1sc00386k
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자연과학대학 > 화학·나노과학전공 > Journal papers
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