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Kessler U, van Wüllen L, Jansen M. Structure of the fluorosulfite anion: rotational disorder of SO(2)F(-) in the alkali metal fluorosulfites and crystal structures of alpha- and beta-CsSO(2)F. Inorg Chem. 2001;40(27):7040-6doi: 10.1021/ic010303+.
Kessler, U., van Wüllen, L., & Jansen, M. (2001). Structure of the fluorosulfite anion: rotational disorder of SO(2)F(-) in the alkali metal fluorosulfites and crystal structures of alpha- and beta-CsSO(2)F. Inorganic chemistry, 40(27), 7040-6. https://doi.org/10.1021/ic010303+
Kessler, U, et al. "Structure of the fluorosulfite anion: rotational disorder of SO(2)F(-) in the alkali metal fluorosulfites and crystal structures of alpha- and beta-CsSO(2)F." Inorganic chemistry vol. 40,27 (2001): 7040-6. doi: https://doi.org/10.1021/ic010303+
Kessler U, van Wüllen L, Jansen M. Structure of the fluorosulfite anion: rotational disorder of SO(2)F(-) in the alkali metal fluorosulfites and crystal structures of alpha- and beta-CsSO(2)F. Inorg Chem. 2001 Dec 31;40(27):7040-6. doi: 10.1021/ic010303+. PMID: 11754288.
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Inorg Chem. 2001 Dec 31;40(27):7040-6. doi: 10.1021/ic010303+.

Structure of the fluorosulfite anion: rotational disorder of SO(2)F(-) in the alkali metal fluorosulfites and crystal structures of alpha- and beta-CsSO(2)F.

Inorganic chemistry

U Kessler, L van Wüllen, M Jansen

Affiliations

  1. Max-Planck-Institut für Festkörperforschung, 70569 Stuttgart, Germany.

PMID: 11754288 DOI: 10.1021/ic010303+

Abstract

19F solid-state NMR spectra of the alkali metal fluorosulfites KSO(2)F, RbSO(2)F, alpha-CsSO(2)F, and beta-CsSO(2)F show that the fluorosulfite anion is subjected to dynamical disorder at room temperature. This disorder can be modeled by 120 degrees rotational jumps with respect to the C(3)-pseudoaxis of the anion. The exchange frequency of this disorder decreases with decreasing temperature. The calculated jump frequencies at room temperature are 5 x 10(5) Hz for KSO(2)F, 2 x 10(5) Hz for RbSO(2)F, 1 x 10(7) Hz for alpha-CsSO(2)F, and 5 x 10(5) Hz for beta-CsSO(2)F, respectively. The crystal structures of alpha- and beta-CsSO(2)F were determined for the first time (alpha: Pnma; Z = 4; a = 790.98(8), b = 666.07(7), c = 798.93(9) pm; T = 293 K. beta: R3m; Z = 3; a = 659.22(6), c = 800.50(4) pm; T = 293 K). X-ray single-crystal data of KSO(2)F, RbSO(2)F, and alpha-CsSO(2)F taken at various temperatures were refined using the disorder model developed from the NMR results. It is shown that it is impossible to obtain reliable structural parameters of the SO(2)F(-) ion by refinement of X-ray data as long as rotational disorder persists. The preference of an ordered structure increases with decreasing temperature. The degree of disorder remaining in alpha-CsSO(2)F at 93 K is small. The structural parameters of the fluorosulfite anion as obtained by a routine refinement of this phase (S-F, 169.0(2) pm; S-O, 147.8(1) pm) are the best lower (S-F) and upper (S-O) limits of the "true" bond lengths determined experimentally. They comply with the values obtained from quantum chemical calculations.

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