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Synthesis Methods for Ce(CrO4)2 · xH2O and Crystal Structures of K2CrSO7, (NH4)2Cr2O7 and Na2Cr2O7 · 2H2O

Barbara M. Casari ; Annika K. Eriksson (Institutionen för kemi- och bioteknik, Oorganisk miljökemi) ; Vratislav Langer (Institutionen för kemi- och bioteknik, Oorganisk miljökemi)
Zeitschrift für Naturforschung. B, A journal of chemical sciences (0932-0776). Vol. 62b (2007), 6, p. 771-777.
[Artikel, refereegranskad vetenskaplig]

New and quick methods to synthesize Ce(CrO4)2 · 2H2O and Ce(CrO4)2 · H2O, giving high yields, are described. The methods are based on exchange reactions by refluxing in water or on solid state reactions. The first crystal structure containing a chromatosulfato ion is presented. K2CrSO7 belongs to space group P21/n with a=7.4024(1), b=7.3908(1), c=12.9883(2) Å , β=90.021(1) and Z = 4. The CrSO72− ion, consisting of one chromate group sharing one oxygen atom with one sulfate group, has a pseudo syn-C2v conformation with eclipsed oxygen atoms. K2CrSO7 forms a three dimensional network of CrSO72− ions held together by the charge balancing potassium ions, with the general structural features common with dichromate-like structures. The redetermination of the structures of (NH4)2Cr2O7 (space group C2/c, with hydrogen atoms located) and Na2Cr2O7 · 2H2O (space group P21, with hydrogen atoms located and the absolute structure established) are reported.

Nyckelord: Hydrated Cerium Chromates, Chromatosulfate, Dichromates, Oxidizing Agents, Single Crystal X-Ray Diffraction

Denna post skapades 2007-05-15. Senast ändrad 2013-08-02.
CPL Pubid: 41675


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Institutionen för kemi- och bioteknik, Oorganisk miljökemi (2005-2014)


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