ISSN:
0044-2313
Keywords:
Chemistry
;
Inorganic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Description / Table of Contents:
Antimon(III) Compounds with SbFnOm Coordination Spheres. Crystal Structures of K(SbF2)HAsO4, NH4(SbF2)HAsO4, and Sb3O2F5K(SbF2)HAsO4 and NH4(SbF2)HAsO4 were prepared from SbF3 and dihydrogen arsenates in aequous solutions. Their structures were determined by single crystal X-ray diffraction. (K(SbF2)HAsO4: a = 726.5(2), b = 726.1(3), c = 1107.3(5) pm, β = 101.1(1)°, Z = 4, space group P21/c, 1160 reflections, 82 parameters, R = 0.022. NH4(SbF2)HAsO4: a = 731.9(1), b = 734.7(1), c = 1128.8(2) pm, β = 100.2(1)°, Z = 4, space group P21/c, 1254 reflections, 82 parameters, R = 0.045). The isostructural compounds contain SbF2+ groups to which three oxygen atoms of different HAsO42- ions are coordinated, resulting in a complicated layer structure. Two Sb—O bonds are shorter tahn 220 pm. The SbIII coordination is pseudo-octahedral with a stereochemically active lone pair. Sb3O2F5 (a = 1315.5(9), b = 592.7(3), c = 902.3(5) pm, β = 107.7(5)°, Z = 4, space group P2/c, 1427 reflections, 92 parameters, R = 0.029) is formed by hydrolysis of SbF3. It displays also a layer structure, with 4 differently pseudo-trigonal bipyramidally coordinated SbIII atoms. The stereochemistry of the title compounds and of related substances with SbOnFm coordination spheres are compared.
Notes:
K(SbF2)HAsO4 und NH4(SbF2)HAsO4 wurden in wäßriger Lösung aus SbF3 und Dihydrogenarsenaten hergestellt und ihre Strukturen durch Röntgenstrukturanalyse aufgeklärt. (K(SbF2)HAsO4: a = 726,5(2), b = 726,1(3), c = 1107,3(5) pm, β = 101,1(1)°, Z = 4, Raumgruppe P21/c, 1160 Reflexe, 82 Parameter; NH4(SbF2)HAsO4: a = 731,9(1), b = 734,7(1), c = 1128,8(2) pm, β = 100,2(1)°, Z = 4, Raumgruppe P21/c, 1254 Reflexe, 82 Parameter). Die isostrukturellen Verbindungen enthalten SbF2+-Einheiten, an die je ein Sauerstoffatom dreier HAsO42--Ionen gebunden ist. Dies führt zu einer komplizierten Schichtstruktur. Zwei Sb-O-Bindungen sind kürzer als 220 pm. Antimon ist pseudo-oktaedrisch koordiniert. Das einsame Elektronenpaar ist stereochemisch aktiv. Sb3O2F5 (a = 1315,5(9), b = 592,7(3), c = 902,3(5) pm, β = 107,7(5)°, Z = 4, Raumgruppe P2/c, 1427 Reflexe, 92 Parameter) entsteht durch Hydrolyse von SbF3. Es zeigt ebenfalls eine Schichtstruktur mit vier unterschiedlich pseudotrigonal bipyramidal koordinierten SbIII-Atomen. Die Stereochemie der Titelverbindungen wird in Zusammenhang mit anderen Verbindungen mit SbOnFm-Koordinationssphären diskutiert.
Additional Material:
2 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/zaac.19895780115
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