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Die Kristallstrukturen von Ph

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Die Kristallstrukturen von Ph

3

AsCl

2

und β -Ph

3

AsBr

2

Crystal Structures of Ph

3

AsCl

2

and β -Ph

3

AsBr

2

Bernhard Neumüller, Soheila Chitsaz und Kurt Dehnicke

Fachbereich Chemie der Universität Marburg, Hans-Meerwein-Straße, D-35032 Marburg Sonderdruckanforderungen an Prof. Dr.

K. Dehnicke. Fax: (+049) 6421 2828917 Z. Naturforsch.54b, 1611Ð1614 (1999);

eingegangen am 23. August 1999 Arsenic, Triphenylarsenic Dichloride,

Triphenylarsenic Dibromide, Crystal Structure Colourless single crystals of Ph3AsCl2 as well as ofβ-Ph3AsBr2were obtained from acetonitrile solutions and were suitable for X-ray structure determinations.

Ph3AsCl2: Space group P212121, Z = 4, lattice dimensions at Ð90∞C: a = 1247.9(2), b = 1267.5(1),c= 1033.4(1) pm,R1= 0.0484.

β-Ph3AsBr2: Space group P 1¯, Z = 4, lattice di- mensions atÐ80∞C:a= 949.1(1),b = 1189.7(1), c= 1693.7(2) pm, α = 98.32(1)∞, β = 103.64(1)∞, γ= 109.44(1)∞,R1= 0.0628. The structures consist of Ph3AsX2molecules (X = Cl, Br) with trigonal- bipyramidal coordination of the arsenic atom with the halogen atoms in the axial positions.

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