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A systematic investigation of the chromate ion in [Ni(II)-(2,2_-bpy)-CrO4 2_ ] systems has been carried out. The effect of the Ni(II) ion and the organic ligand on the mode of the chromate position in the [Ni(bpy)3]CrO4_7.5H2O(1), [Ni(bpy)2(OCrO3)(H2O)]_5H2O(2) and catena-(ž-CrO4-O,O_)[Ni(bpy)(H2O)2]_2H2O (3) complexes has been shown. [Ni(bpy)3]CrO4_7.5H2O crystals (1) have a monoclinic symmetry with space group C2/c and 8 chemical units, forming a unit cell with a = 13.641(3) A, b = 22.939(5) A, c = 23.351(5) A and _ = 104.69(3) deg, whereas the [Ni(bpy)2(OCrO3)(H2O)]_5H2O crystals (2) have a monoclinic symmetry with space group P21/c and 4 chemical units per unit cell with a = 10.854(2) A, b = 22.665(5) A, c = 10.623(2) A and _ = 108.93(3) deg at room temperature. The chromate ion in 1 is not coordinated to the nickel(II) ion. The geometry around the Cr(VI) atom is pseudotetrahedral. Untypical for the chromate ion monodentate coordination has been found in the complex [Ni(bpy)2(OCrO3)(H2O)]_5H2O. The chromate position has been also elucidated from the digitally resolved IR spectra. The coordination of the chromate ion in 2 and 3 was also observed for the single crystal at 4K, in reflectance and solution electronic spectra through the appearance of a new transition at ca. 15000 cm-1. The full characterization of the chromophores present in the complexes: NiN6, NiN4O2, NiN2O4 and NiO6 have been obtained on the basis of the detailed analysis of the electronic spectra at 4K(Gaussian deconvolution followed by digital filtration).
Słowa kluczowe
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Czasopismo
Rocznik
Tom
Strony
309--324
Opis fizyczny
Bibliogr. 60 poz., rys.
Twórcy
autor
- Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Okólna 2, 59-950 Wrocław, Poland
autor
- Institute of Physics, Wrocław Univiersity of Technology
autor
- Institute of lnorganic Chemistry and Metallurgy of Rare Elements, Wrocław University of Technology
autor
- Faculty of Computer Science and Management, Wrocław University of Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland
autor
- Institute of lnorganic Chemistry and Metallurgy of Rare Elements, Wrocław University of Technology
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Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-BUJ1-0020-0033