Tin halogen compounds. 2. Molecular and crystal structures of tin(IV) bromide and iodide

Autor(en): Reuter, H 
Pawlak, R
Stichwörter: Crystallography
Erscheinungsdatum: 2001
Herausgeber: R OLDENBOURG VERLAG
Journal: ZEITSCHRIFT FUR KRISTALLOGRAPHIE
Volumen: 216
Ausgabe: 1
Startseite: 34
Seitenende: 38
Zusammenfassung: 
Single crystals of tin(IV) bromide and iodide were obtained by sublimation (SnBr4) and recrystallization (SnI4). The crystal structures of this compounds were examined by means of X-ray diffraction on a four circle diffractometer. SnBr4 crystallizes at -30 degreesC in the monoclinic space group P2(1)/c (No.14) with a=1037.1(2), b=700.6(1), c=1047.0(2)pm, beta =102.56(1)degrees, V= 742.5(2)10(6) pm(3), Z=4. SnI4 crystallizes at room temperature in the cubic space group Pa (3) over bar with a = 1226.81(8) pm, V= 1846.4(3) . 10(6) pm(3), Z = 8. Both structures consist of very slightly distorted tetrahedral SnX4-molecules. The mean Sn-X-distances are 242.3 pm (Sn-Br) and 265.1 pm (Sn-I), which are significantly smaller than the sum of the normal covalent radii. The crystal structures are based on a hexagonal (bromide) and cubic-close (iodide) packing of the halogen atoms, in which only 1/8 of the tetrahedral sites are occupied by tin atoms. An approach for the description of the crystal structure of tin(IV) iodide on the base of the cubic-close packing is given.
ISSN: 00442968
DOI: 10.1524/zkri.216.1.34.18992

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