Verfeinerung der Kristallstruktur des Natriumperchlorats NaClO4
Abstract
The crystal structure of anhydrous sodium perchlorate NaClO4 (space group Cmcm—D172h, anhydrite type) has been refined by the least squares method to R = 0,040, using three dimensional x-ray diffraction data and anisotropic thermal parameters. The cell dimensions at 26°C are: a = 7.085, b = 6.526, c = 7.048 Å. The perchlorate group is slightly stretched along its twofold axis, which lies parallel to the crystallographic b-axis, and has the symmetry C2v. The mean Cl—O bond length is 1.435 Å, the mean Na—O distance is 2.54 Å and the average O—O distance between neighboured anions is 3.33 Å.
Using the observed anisotropic thermal parameters for the chlorine atom and for the oxygen atoms the rigid-body motion analysis yields r.m.s. amplitudes for the translational motions of the perchlorate group parallel to the crystallographic axes a, b, c of 0.134, 0.127 and 0.129 Å. The components of the librational tensor correspond to oscillations about the principal axes, which are parallel to the crystallographic axes, of 6.2°, 6.8° and 6.9°. The libration causes the apparent Cl—O bond length to be shortened by 0.02 Å.
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Articles in the same Issue
- An application of the Patterson method to the determination of the structures composed of two kinds of layers with approximately equal thickness
- Madelung energies and cation distributions in olivine-type structures
- Refinement of the crystal structure of diphenylacetylene
- Crystal-structure determination of euphenyl chloroacetate
- Die Kristall- und Molekülstruktur von 1,3,7,8,8a,9-Hexachlor-4a,5,6,8a-tetrahydro-1,3epidioxy-4,6-methanoisochroman
- Thermal expansion from 25° to 500°C of a few ionic radii
- Lattice parameters and space group of bis-2-bromo-5methoxy-benzylidine-succinic acid (C20H16O6Br2)
- Dichlorophosphate von Niob, Tantal, Zirkonium und Hafnium; die Kristallstruktur von NbOCl3 · POCl3
- Limiting forms and comprehensive complexes for crystallographic point groups, rod groups and layer groups
- Verbotene Reflexe im Röntgenbeugungsbild von Boratran, B(OC2H4)3N
- The scaling of X-ray intensity data: on the calculation of |E| values
- The crystal structure of emeleusite, a novel example of sechser-doppelkette
- Verfeinerung der Kristallstruktur des Natriumperchlorats NaClO4
- Preparation and X-ray analysis of trimethylsulfonium sulfate [(CH3)3S+]2SO2−4
- Jahresversammlung der Schweizerischen Gesellschaft für Kristallographie
