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A I SeC 2 H (A I =K, Rb, Cs): Crystalline Compounds with the Elusive − Se‐C≡C‐H Anion
Author(s) -
Hetzert Marc,
Werker Melanie,
Ruschewitz Uwe
Publication year - 2018
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201810910
Subject(s) - orthorhombic crystal system , chemistry , alkali metal , selenium , crystallography , x ray crystallography , powder diffraction , ammonia , ion , elemental analysis , acetylene , crystal structure , inorganic chemistry , diffraction , organic chemistry , physics , optics
Abstract By reaction of alkali metal acetylides, A I C 2 H (A I =K, Rb, Cs), with elemental selenium in liquid ammonia highly crystalline powders of A I SeC 2 H were obtained. The structure analysis based on the resulting synchrotron powder diffraction data revealed that all compounds crystallize in an orthorhombic unit cell (Cmc2 1 , Z =4) exhibiting the elusive − SeC 2 H anion, which is unprecedented in a crystalline compound up to now. Elemental analysis and IR spectroscopic data confirm this finding. Upon heating, A I SeC 2 H compounds release acetylene based on DSC/TGA experiments resulting in powders with the proposed composition A I 2 Se 2 (C 2 ). The resulting powders were indexed with small cubic unit cells, but a reasonable structural model could not be developed up to now. Upon exposure of A I SeC 2 H compounds to water elemental selenium is formed again.