Zur Kenntnis Von Calciumtetrahydrogen Hexaoxo ...
Zur Kenntnis von Calciumtetrahydrogen-hexaoxo-diperiodattetrahydrat
CaH4I2O10 · 4 H2O: Kristallstruktur, Schwingungsspektren und
thermische Analyse
On Calciumtetrahydrogen-hexaoxo-diperiodatetetrahydrate CaH I O
4 H O:
4 2
10
2
Crystal Structure, Vibrational Spectroscopy and Thermal Analysis
H. Haeuseler und M. Botova
Anorganische Chemie der Universit¨at, D-57068 Siegen
Sonderdruckanforderungen an Prof. H. Haeuseler E-mail: haeuseler@chemie.uni-siegen.de
Herrn Professor Albrecht Mewis zum 60. Geburtstag gewidmet
Z. Naturforsch. 57 b, 1337–1345 (2002); eingegangen am 17. Juni 2002
Periodate, Crystal Structure, Vibrational Spectroscopy, Thermal Analysis
By crystallisation from a strongly acidic aqueous solution calciumtetrahydrogen-hexaoxo-di-
periodatetetrahydrate CaH4I2O10 4 H2O has been obtained. In the structure of this compound
(S. G. C2/c, Nr. 15), Z = 4, a = 1986,6(4), b = 564,2(1), c = 1149,4(20) pm,
= 120,62(3) )
centrosymmetric H
2
4I2O10
anions in the form of edge-sharing octahedra form layers via
hydrogen bonds originating from the acidic, trans-configurated OH groups of the anions. IR
and Raman spectra are analysed with respect to the hydrogen bond system and the internal
vibrations of the periodate anion. The dehydration of the compound takes place via Ca(IO4)2
5 H2O and Ca(IO4)2 2H2O leading at 143 C to the anhydrous metaperiodate Ca(IO4)2 which
decomposes above 248 C to Ca(IO3)2.
