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Reaction with SO 3 in Ionic Liquids: The Example of K 2 (S 2 O 7 )(H 2 SO 4 )
Author(s) -
Weiz Alexander,
Bruns Jörn,
Wickleder Mathias S.
Publication year - 2014
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.201300416
Subject(s) - orthorhombic crystal system , chemistry , molecule , denticity , crystal structure , sulfuric acid , ionic liquid , crystallography , hydrogen bond , ionic bonding , inorganic chemistry , solvent , crystal (programming language) , ion , catalysis , organic chemistry , computer science , programming language
The ionic liquid 1‐butyl‐3‐methylimidazolium hydrogensulfate, [bmim]HSO 4 , turned out to be resistant even to strong oxidizers like SO 3 . Thus, it should be a suitable solvent for the preparation of polysulfates at low temperatures. As a proof of principle we here present the synthesis and crystal structure of K 2 (S 2 O 7 )(H 2 SO 4 ), which has been obtained from the reaction of K 2 SO 4 and SO 3 in [bmim]HSO 4 . In the crystal structure of K 2 (S 2 O 7 )(H 2 SO 4 ) (orthorhombic, Pbca , Z = 8, a = 810.64(2) pm, b = 1047.90(2) pm, c = 2328.86(6) pm, V = 1978.30(8) Å 3 ) two crystallographically unique potassium cations are coordinated by a different number of monodentate and bidentate‐chelating disulfate anions as well as by sulfuric acid molecules. The crystal structure consists of alternating layers of [K 2 (S 2 O 7 )] slabs and H 2 SO 4 molecules. Hydrogen bonds between hydrogen atoms of sulfuric acid molecules and oxygen atoms of the neighboring disulfate anions are observed.