Journal
CHEMPLUSCHEM
Volume 77, Issue 6, Pages 476-481Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cplu.201200037
Keywords
ab initio calculations; protonated dimethyl sulfoxide; superacid systems; vibrational spectroscopy; X-ray diffraction
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Funding
- Deutsche Forschungsgemeinschaft
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Dimethyl sulfoxide (DMSO) reacts with the superacidic solutions of XF/MF5 and XF/GeF4 (X=H, D; M=As, Sb) under formation of the corresponding salts [(CX3)2SOX+]MF6- and [(CH3)2SOH+]4Ge3F164-, respectively. The salts are characterized by vibrational and NMR spectroscopy, and in the case of [(CH3)2SOH+]4Ge3F164- also by single-crystal X-ray analysis. The salt [(CH3)2SOH+]4Ge3F164- crystallizes in the monoclinic space group P21/c with two formula units in the unit cell. The crystal structure possesses an unusual anion consisting of a chain of three slightly distorted fluorine-bridged GeF6 octahedra. The vibrational spectra are compared to the quantum chemically calculated free [(CX3)2SOX+] cations. The described salts are isolated examples of completely protonated DMSO molecules in the condensed phase.
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