Synthesis and Characterisation of New Arsonium Salts and Crystal Structures of Trimethylarsonium Undecafluorodiarsenate (CH3)3AsH+As2F11− and Trimethylarsonium Hexafluoroantimonate (CH3)3AsH+SbF6

• Published in: European journal of inorganic chemistry Vol. 1999; no. 12; pp. 2249 - 2254
• Main Authors: Minkwitz, Rolf, Hirsch, Claudia, Berends, Thorsten
• Format: Journal Article
• Language: English
• Published: Weinheim WILEY-VCH Verlag GmbH 01.12.1999; WILEY‐VCH Verlag GmbH
• Subjects: Arsonium salts; Structure elicidation; Superacidic systems
• ISSN: 1434-1948; 1099-0682
• DOI: 10.1002/(SICI)1099-0682(199912)1999:12<2249::AID-EJIC2249>3.0.CO;2-1

The reaction of trimethylarsane in the superacidic systems hydrogen/fluoride antimony pentafluoride and hydrogen fluoride/arsenic pentafluoride leads to trimethylarsonium fluorometallates. These salts are stable up to 60 °C and 5 °C, respectively. Structures were successfully elucidated in the cases of trimethylarsonium undecafluorodiarsenate and trimethylarsonium hexafluoroantimonate. (CH3)3AsH+As2F11− crystallizes in the monoclinic space group P21/n with four formula units per unit cell with the dimensions a = 7.362(1), b = 12.589(1), c = 13.598(1) Å and β = 95.37(1)°. (CH3)3AsH+SbF6− crystallizes in the monoclinic space group P21/m with four formula units per unit cell with the dimensions a = 8.313(1), b = 8.855(1), c = 13.285(1) Å and β = 94.358(1)°.