Crystal structures of potassium, ammonium, rubidium, and cesium tetrafluoborates
- 15 July 1969
- journal article
- Published by Canadian Science Publishing in Canadian Journal of Chemistry
- Vol. 47 (14) , 2579-2586
- https://doi.org/10.1139/v69-426
Abstract
The crystal structures of potassium, ammonium, and rubidium tetrafluoborates have been redetermined. The structure of cesium tetrafluoborate has also been established. These 4 compounds are isomorphous and show orthorhombic symmetry, space group Pbnm. Atomic parameters have been obtained from a block diagonal least squares refinement using anisotropic temperature parameters. The final agreement residuals for observed reflections were KBF4, R = 0.072; NH4BF4, R = 0.075; RbBF4, R = 0.064; and CsBF4, R = 0.051.There are significant differences between some of the B—F bond distances in the [BF4]− ions. The shortest N—(H)F distance in NH4BF4 is 2.914 Å (estimated standard deviation 0.005 Å) which is long for a hydrogen bond. The positions of the hydrogen atoms in the NH4+ ion could not be established.Keywords
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