ISSN:
1573-8779
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Summary The structure of hydrofluorides with the composition MeF2 · HF(Me=Sr, Ba) includes two anions: F− and HF2 − with a linear hydrogen bond. In SrF2 · HF, the hydrogen bond is characterized by a more asymmetrical position of the proton than in BaF2 · HF. Increasing the number of added HF molecules leads to the formation of two bifluoride ions in the compounds CaF2 · 2HF and SrF2 · 2.5HF. The hydrogen bond in this case is also nonsymmetrical, and the average F−H distance is equal to 1.17 A. Thus, the hydrogen bond in these compounds is of the same order as in KF · 2HF (rF−F=2.33 A) [12],i.e., weaker than in KF · HF (rF−F=2.26 A) [13], but stronger than in solid HF (rF−F=2.49 A) [14]. A structure with two polyfluoride anions evidently corresponds to the compound BaF2 · 3HF.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00743489
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