Skip to content
Licensed Unlicensed Requires Authentication Published by De Gruyter (O) September 25, 2009

Crystal structures of GaX3 (X = Cl, Br, I) and AlI3

  • Sergey I. Troyanov , Thoralf Krahl and Erhard Kemnitz

Abstract

Crystal structures of GaX3 (X = Cl (I), Br (II), and I (III)) and AlI3 (IV) were determined at low temperature by single crystal X-ray crystallography. I is monoclinic, space group C2/m with a = 11.948(4), b = 6.855(3), c = 7.050(3) Å, β = 125.69(3)°, Z = 4, R1 = 0.038. IIIV are isotypic to each other: II is monoclinic, space group P21/c with a = 8.874(4), b = 5.637(2), c = 11.006(4) Å, β = 107.81(4)°, Z = 4, R1 = 0.056; III: a = 9.584(3), b = 6.084(2), c = 11.839(4) Å, β = 107.78(3)°, R1 = 0.044; IV: a = 9.591(3), b = 6.069(2), c = 11.902(3) Å, β = 108.05(3)°, R1 = 0.046. The crystal structures IIV are built of dimeric M2X6 molecules consisting of two MX4 tetrahedra sharing a common XX edge with shorter M-X (terminal) and longer M-X(bridging) distances. The structure of I can not be described in terms of the closest Cl packing, whereas the structures of IIIV are based on slightly distorted cubic closest packing of halogen atoms, which accounts for their strong tendency to twinning.

:
Published Online: 2009-9-25
Published in Print: 2004-2-1

© 2004 Oldenbourg Wissenschaftsverlag GmbH

Downloaded on 28.3.2024 from https://www.degruyter.com/document/doi/10.1524/zkri.219.2.88.26320/html
Scroll to top button