Crystal structures of the α alums CsM[SO4]2·12H2O (M = Rh or Ir)
- 1 January 1983
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 9,p. 1973-1975
- https://doi.org/10.1039/dt9830001973
Abstract
Structure determinations of the alums CsM[SO4]2·12H2O have been carried out for M = rhodium(III) and iridium(III), providing the first structurally characterized examples of the hexa-aqua-rhodium(III) and -iridium(III) species. Structures were determined at 295(1) K and refined to R= 0.034 and 0.028 for 546 and 696 independent ‘observed’ reflections for Rh and Ir respectively. Crystals are cubic, space group Pa3 with a= 12.357(5) and 12.395(3)Å respectively; Rh–O is 2.016(3) and Ir–O 2.041(3)Å. Both alums are of the α type. Single-crystal Raman spectra of the S–O stretching vibrations are reported which distinguish between the α and β caesium alums.Keywords
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