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- W2098972007 endingPage "6829" @default.
- W2098972007 startingPage "6829" @default.
- W2098972007 abstract "A tridentate benzoxazole-containing aminophenol ligand HLBAP was synthesized and complexed with CuII. The resulting CuII complexes were characterized by X-ray, IR, UV-vis-NIR spectroscopies, and magnetic susceptibility studies, demonstrating that the ligand is oxidized to the o-iminosemiquinone form [LBIS]− in the isolated complexes. LBISCuIICl exhibits a distorted tetrahedral geometry, while LBISCuIIOAc is square pyramidal. In both solid state structures the ligand is coordinated to CuIIvia the benzoxazole, as well as the nitrogen and oxygen atoms from the o-iminosemiquinone moiety. The chloride, or acetate group occupies the fourth and/or fifth positions in LBISCuIICl and LBISCuIIOAc, respectively. Magnetic susceptibility measurements indicate that both complexes are diamagnetic due to antiferromagnetic coupling between the d9 CuII centre and iminosemiquinone ligand radical. Electrochemical studies of the complexes demonstrate both a quasi-reversible reduction and oxidation process for the Cu complexes. While LBISCuIIX (X = Cl) is EPR-silent, chemical oxidation affords a species with an EPR signal consistent with ligand oxidation to form a d9 CuII iminoquinone species. In addition, chemical reduction results in a CuII centre most likely bound to an amidophenoxide. Mild and efficient oxidation of alcohol substrates to the corresponding aldehydes was achieved with molecular oxygen as the oxidant and LBISCuIIX–Cs2CO3 as the catalyst." @default.
- W2098972007 created "2016-06-24" @default.
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- W2098972007 creator A5083010457 @default.
- W2098972007 date "2013-01-01" @default.
- W2098972007 modified "2023-10-16" @default.
- W2098972007 title "Synthesis, characterization and catalytic activity of copper(ii) complexes containing a redox-active benzoxazole iminosemiquinone ligand" @default.
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