The photolytic release of copper from the copper penicillamine complex [Cu(II)6Cu(I)8(D-penicillamine)12Cl]5-

Tipo de material: Texto

TextoSeries ; Inorganica Chimica Acta, 152(4), p.219-222, 1988Trabajos contenidos:

Deuschle, Ulrich
Weser, Ulrich

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Resumen: The light sensitivity of CuPen ([Cu(II)6Cu(I)8(D-penicillamine)12Cl]5? was examined. The wavelength range of the photolytic activity was determined in the visible and near-ultraviolet region of the electromagnetic spectrum. No photolytic activity was observed above 450 nm. The quantum yield of copper release was measured between 450 nm and 250 nm and was found to increase from 0 to 0.1. A shoulder around 400 nm corresponding to electronic absorption and CD features was observed in the photo-action spectrum. Inhibition of formazan formation from nitroblue tetrazolium mediated by xanthine oxidase-generated superoxide was used to quantify the copper release as a result of the photolytic decomposition of CuPen. The influence of oxygen on the photolytic reaction was investigated by EPR and electronic absorption spectroscopy. In the absence of oxygen, visible light induces almost total bleaching. However, EPR reveals only slight changes in the spin concentration. Upon introduction of aerobic EDTA all of the copper is immediately oxidised to Cu(II).

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The light sensitivity of CuPen ([Cu(II)6Cu(I)8(D-penicillamine)12Cl]5? was examined. The wavelength range of the photolytic activity was determined in the visible and near-ultraviolet region of the electromagnetic spectrum. No photolytic activity was observed above 450 nm. The quantum yield of copper release was measured between 450 nm and 250 nm and was found to increase from 0 to 0.1. A shoulder around 400 nm corresponding to electronic absorption and CD features was observed in the photo-action spectrum. Inhibition of formazan formation from nitroblue tetrazolium mediated by xanthine oxidase-generated superoxide was used to quantify the copper release as a result of the photolytic decomposition of CuPen. The influence of oxygen on the photolytic reaction was investigated by EPR and electronic absorption spectroscopy. In the absence of oxygen, visible light induces almost total bleaching. However, EPR reveals only slight changes in the spin concentration. Upon introduction of aerobic EDTA all of the copper is immediately oxidised to Cu(II).

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