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- Carlsson, Bo, et al.
(author)
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Determination of the Equilibrium Constants and UV-Absorption Spectra for Cu2+- Cl- Complexes in 1M HClO4
- 1976
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In: Journal of inorganic and nuclear chemistry. ; 38:8, s. 1525-1527
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Journal article (peer-reviewed)abstract
- The complex constants for the Cu(II)-chloride complexes CuCl+ and CuCl2 have been determined spectrophotometrically at 25°C and in 1 M HClO4. The evaluation procedure employed was a regression analysis for the simultaneous determination of complex constants and absorption spectra and yielded K1 = 2.3 ± 0.4 and K2 = 0.72 ± 0.09. There is a strong overlap between the 2 absorption spectra (λmax = 250 nm in both cases, ε1=530, , ε2 = 1620) which made it particularly necessary to arrange the numerical analysis in such a way that the spectral differences were fully exploited.
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- Carlsson, Bo, et al.
(author)
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Optical Properties of Metallic Copper in Relation to the Photochromic System CuCl(s)-H2O(l)
- 1976
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In: Journal of Photochemistry. - : Elsevier BV. - 0047-2670. ; 5:4, s. 321-328
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Journal article (peer-reviewed)abstract
- An extended Mie theory has been used to interpret the green colour change observed in the photochemical disproportionation of CuCl. Comparison of calculated and experimental spectra leads to the following conclusions: (i) the green colour arises from colloidal metallic copper in CuCl present in low concentrations (<5 vol %); (ii) the colloid consists of particles with an average diameter of about 3 nm in diameter and probably oblate in shape with an axis ratio of about 0.6; (iii) under the conditions of the present experiment the spectrum of the green species stayed constant, i.e. continued exposure has primarily the effect of increasing the number of copper particles without affecting their size and shape.
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| 6. |
- Carlsson, Bo, et al.
(author)
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Studies of the Photochromic Properties of the System CuCl(s)-H2O(l) Using Auger Electron Spectroscopy
- 1977
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In: Journal of Photochemistry. - : Elsevier BV. - 0047-2670. ; 7:1, s. 51-58
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Journal article (peer-reviewed)abstract
- The photochromic disproportionation of Cu+ into Cu2+ and Cu0 has been studied in the system CuCl(s)---H2O(l) by obtaining Auger electron spectroscopy measurements of copper in CuCl. The MMM Auger spectrum of CuCl consists mainly of one broad peak with a maximum at an energy 4 eV lower than the two main peaks in the spectrum of metallic copper. In photochromic coloured CuCl only one additional peak appears within the energy range of the peaks of metallic copper, but in the spectrum of CuCl exposed to a concentrated electron beam both metallic copper peaks are visible. This provides experimental evidence that photochemically produced metallic copper clusters in CuCl are extremely small compared with the metallic copper particles formed during electron exposure.
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