Solid hexafluorobenzene
- 1 January 1973
- journal article
- research article
- Published by Taylor & Francis in Molecular Physics
- Vol. 25 (1), 81-86
- https://doi.org/10.1080/00268977300100101
Abstract
X-ray analysis of hexafluorobenzene at 120 K has shown that the space group is P21/n(C 2h 5), with six molecules per unit cell, and a = 16·82, b = 9·17, c = 5·76Å, β = 95·8°. Four of the molecules in the unit cell are in general positions (Wyckoff position e) and two are in special positions at centres of symmetry (Wyckoff position c). At both types of site, the molecules are planar to within 0·01 Å; in them C-C = 1·36 ± 0·02 Å and C-F = 1·32 ± 0·017 Å. The thermal libration tensors, calculated from the atom thermal parameters, show that molecular oscillations are less constrained at type e than at type c sites.Keywords
This publication has 6 references indexed in Scilit:
- Rotational Diffusion Rates in Molecular Crystals Relations to Molecular Structure and to Crystal Packing DensityMolecular Crystals, 1968
- Thermodynamic properties of fluorine compounds. Part 2.—Physical and thermodynamic properties of hexafluorobenzeneTransactions of the Faraday Society, 1965
- 1014. Molecular compounds and complexes. Part I. The crystal structure of the equimolar molecular complex of hexabromobenzene and 1,2,4,5-tetrabromobenzeneJournal of the Chemical Society, 1964
- Steric forces in halogen-substituted benzenesMolecular Physics, 1959
- The crystal structure of benzene at — 3°CProceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 1958
- The analysis of the anisotropic thermal motion of molecules in crystalsActa Crystallographica, 1956