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Synthesis and properties of ambient temperature molten salts based on the quaternary ammonium ion

journal contribution
posted on 01.09.1997, 00:00 authored by J Sun, D MacFarlane, Maria ForsythMaria Forsyth
The synthesis of 16 tetraalkyl ammonium bis(trifluoromethane sulfonyl) imide salts, (CnH2n+1)4 +N -N (SO2CF3)2 (n = 1, 2, 3, 4),  (C2H5)2(i-C3H7)2 +N -N(SO2CF3)2, (C2H5)(CH3)(i-C3H7)2+N-N(SO2CF3)2, (n-C7H15)(C2H5)i-C3H7)2+N-N(SO2CF3)2 and (CnH2n+1)(CmH2m+1)3+N-N(SO2CF3)2 (n = 6,7,8; m = 1, 2, 4) are reported in this paper. Trends in properties of these salts are discussed. The symmetrical tetraalkyl ammonium salts with the bis(trifluoromethyl sulfonyl) imide anion exhibited a lower melting point than that of corresponding ammonium halides. The salts with low symmetry ammonium cations were found to be of generally lower melting point, and many were stable liquids at room temperature. Several of these did not crystallize during cooling below room temperature and exhibited glass transition temperatures in the region of −60 °C∼−80 °C. A comparison of properties between the ammonium imide salts and corresponding trifluoromethane sulfonates is also presented.

History

Journal

Ionics

Volume

3

Issue

5-6

Pagination

356 - 362

Publisher

Springer

Location

[Berlin, Germany]

ISSN

0947-7047

eISSN

1862-0760

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

1997, Springer