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Spectral and Electrochemical Study of Coordination Molecules Cu 4OX 6L 4: Cu 4 OBrnCl (6−n) (Pyridine) 4 Complexes
Ondrejovič, G. and Kotočová, A. Spectral and Electrochemical Study of Coordination Molecules Cu 4OX 6L 4: Cu 4 OBrnCl (6−n) (Pyridine) 4 Complexes Chemical Papers, Vol.59, No. 3, 2005, 166-173
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Document type:
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Článok z časopisu / Journal Article |
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Collection:
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Chemical papers
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| Attached Files |
| Name |
Description |
MIMEType |
Size |
Downloads |
n593a166.pdf
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593a166.pdf |
application/pdf |
254.58KB |
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| Author(s) |
Ondrejovič, G.
Kotočová, A.
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| Title |
Spectral and Electrochemical Study of Coordination Molecules Cu 4OX 6L 4: Cu 4 OBrnCl (6−n) (Pyridine) 4 Complexes
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| Journal name |
Chemical Papers
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| Publication date |
2005
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| Year available |
2005
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| Volume number |
59
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| Issue number |
3
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| ISSN |
0366-6352
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| Start page |
166
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| End page |
173
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| Place of publication |
Poland
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| Publisher |
Versita
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| Collection year |
2005
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| Language |
english
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| Subject |
250000 Chemical Sciences
250200 Inorganic Chemistry
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| Abstract/Summary |
The tetranuclear Cu4OBrnCl(6−n)(py)4 complexes, where py = pyridine and n = 0—6, with trigonal bipyramidal coordination of copper were prepared and their electronic spectra and cyclic voltammograms in nitromethane solutions were measured. The energy, intensity, and half-width of the two overlapped d—d bands were obtained by the Gaussian resolution. The maxima of the high-energy bands assigned to e(dxz, dyz) → a1(dz2 ) transitions are in a linear correlation with the number of bromoligands, n, ˜ν2max(G)/cm−1 = −53.0n + 13420. The maxima of the lowenergy bands assigned to e(dx2−y2, dxy) → a1(dz2) transitions approximate a polynomial correlation ˜ν1max(G)/cm−1 = −7n − 3n2 + 11300. Formal reduction potentials E_1/2 of the complexes varied with the number of bromoligands in the range 457 mV—519 mV. This variation is described by the equation E_1/2(n) = E_1/2(3) − k log [(6 − n)/n], k represents the constant, its average value is 9.8 mV. The electrochemical results correspond with the electronic spectra suggesting that the electron enters the half-filled dz2 orbital of the copper(II) atom.
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