Abstract
The crystal structure of a previously unknown polymorph of TlTeF 5 has been solved and refined to R 1 = 0.045 and ωR 2 = 0.088 on the basis of 791 independent reflections recorded from a single crystal with an automatic four-circle diffractometer. This new form crystallises with orthorhombic symmetry (space group Pnma) and unit cell parameters: a = 1682.3 (2) pm, b = 622.2 (1) pm, c = 479.5 (1) pm, Z = 4. The Te IV atoms are fivefold coordinated and their lone pairs E are stereochemically active. The Tl atoms are 12-fold co-ordinated, at the centre of anticuboctahedra. The independent TeF 5E polyhedra and the Tl atoms are distributed at the corners of a highly distorted centred cubic network and constitute (NH 4) 2SiF 6-like sheets parallel to (100) and separated by the lone pairs E. This structure can also be described as an alternate stacking along the b axis of purely anionic square 4 4 layers F 4 and of mixed TlTeFE layers. Comparisons are made with other M ITeF 5 pentafluorotellurates.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
