Designing ionic liquids with boron cluster anions: alkylpyridinium and imidazolium [nido-C(2)B(9)H(11)] and [closo-CB(11)H(12)] carborane salts

J. Dymon, R. Wibby, J. Kleingardner, J.M. Tanski, I.A. Guzei, John Holbrey, A.S. Larsen

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Abstract

A range of new alkylpyridinium and imidazolium carborane salts with [nido-C2B9H12](-), [closo-CB11H12](-), and [RC2B11H11](-) (R = methyl or butyl) anions have been prepared and characterized by physical and thermal methods, including the solid state structures of five of the salts determined by single crystal X-ray diffraction. The tendency of the salts to form low-melting ionic liquids has been assessed; all the salts studied with [nido-C2B9H12](-) anions melted below 100 degrees C and, significantly, have melting points that are 25-85 degrees C lower than those of the corresponding [closo-CB11H12](-) analogs, demonstrating that a wider range of boron-rich ionic liquid materials can be readily accessed.
Original languageEnglish
Pages (from-to)2999-3006
Number of pages8
JournalDalton Transactions
Volume2008
Issue number22
Early online date02 May 2008
DOIs
Publication statusPublished - 2008

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