ISSN:
0044-2313
Keywords:
Chemistry
;
Inorganic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Description / Table of Contents:
On the Structure of Ba2Wo3F4 and Ba2MoO3F4Ba2[WO2/2O2F2]F2 has been prepared for the first time as colourless single crystals (from powder, Au-tube, 680°C, 90 d). It crystallizes in the monoclinic (C c) crystal system with a = 1151.1, b = 938.2, c = 718.8 pm, ß = 126.17°, Z = 4. dx = 6.17, dpyk = 6.13 g · cm-3. (Fourcirclediffractometer PW 1100, Fa. Philips, MoKα-, ω-2Θ-scan, 1832 I0(hkl) R = 8.3, Rw = 7.4%). Parameters see in the text. The isotypic Ba2MoO3F4 has been prepared as powder (a = 1147.5, b = 937.0, c = 725.1 pm, ß = 126.42°). The structure shows chains of (WO2/2O2F2) groups along [001]. To establish O2- and F- on the positions IR and Raman Spectra are employed. The Madelung Part of Lattice Energy, MAPLE, is calculated and discussed.
Notes:
Erstmals wurden farblose Einkristalle von Ba2[WO2/2O2F2]F2 (aus Pulver, Au-Rohr, 680°C, 90 d) dargestellt, die monoklin, C c, mit a = 11,511, b = 9,382, c = 7,188 Å, ß = 126,17°, Z = 4, dx = 6,17 und dpyk = 6,13 g · cm-3 kristallisieren. (Vierkreisdiffraktometer PW 1100, Fa. Philips, MoKα-, ω-2Theta;-scan, 1832 I0(hkl) R = 8,3% und Rw = 7,4%). Parameter s. Text. Isotyp ist Ba2MoO3F4 mit a = 11,475, b = 9,370, c = 7,251 Å, ß = 126,42°, als Pulver erhalten. Charakteristisches Strukturelement ist die Kette (WO2/2O2F2) längs [001]. Der Madelunganteil der Gitterenergie, MAPLE sowie IR- und Raman-Spektren werden zur Festlegung der Verteilung von O2- und F- auf den Anionenpositionen herangezogen und diskutiert.
Additional Material:
3 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/zaac.19845181115
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