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• W2042396363 abstract "The anionic complexes [Cu(L1−)3]1−, L− = dopasemiquinone or L-dopasemiquinone, were prepared and characterized. The complexes are stable in aqueous solution showing intense absorption bands at ca. 605 nm for Cu(II)-L-dopasemiquinone and at ca. 595 nm for Cu(II)-dopasemiquinone in the UV–vis spectra, that can be assigned to intraligand transitions. Noradrenaline and adrenaline, under the same reaction conditions, did not yield Cu-complexes, despite the bands in the UV region showing that noradrenaline and adrenaline were oxidized during the process. The complexes display a resonance Raman effect, and the most enhanced bands involve ring modes and particularly the νCC + νCO stretching mode at ca. 1384 cm−1. The free radical nature of the ligands and the oxidation state of the Cu(II) were confirmed by the EPR spectra that display absorptions assigned to organic radicals with g = 2.0005 and g = 2.0923, and for Cu(II) with g = 2.008 and g = 2.0897 for L-dopasemiquinone and dopasemiquinone, respectively. The possibility that dopamine and L-dopa can form stable and aqueous-soluble copper complexes at neutral pH, whereas noradrenaline and adrenaline cannot, may be important in understanding how Cu(II)-dopamine crosses the cellular membrane as proposed in the literature to explain the role of copper in Wilson disease." @default.
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• W2042396363 date "2008-12-01" @default.
• W2042396363 modified "2023-10-16" @default.
• W2042396363 title "Raman, IR, UV–vis and EPR characterization of two copper dioxolene complexes derived from L-dopa and dopamine" @default.
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• W2042396363 doi "https://doi.org/10.1016/j.saa.2008.04.014" @default.
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