Contrasting thermosolvatochromic trends in pyridinium-, pyrrolidinium-, and phosphonium-based ionic liquids

Khupse, Nageshwar D. ; Anil Kumar, (2010) Contrasting thermosolvatochromic trends in pyridinium-, pyrrolidinium-, and phosphonium-based ionic liquids Journal of Physical Chemistry B, 114 (1). pp. 376-381. ISSN 1089-5647

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Official URL: http://pubs.acs.org/doi/abs/10.1021/jp908498p?prev...

Related URL: http://dx.doi.org/10.1021/jp908498p

Abstract

Thermosolvatochromism has been studied in three series of ionic liquids, pyridinium-based 1-butylpyridinium, 1-hexylpyridinium, and 1-octylpyridinium with bis(trifluoromethylsulfonyl) imide [NTf2] and tetrafluoroborate [BF4] anions, pyrrolidinium-based ionic liquids 1-methyl-1-butylpyrrolidium, 1-methyl-1-hexylpyrrolidium, 1-methyl-1-octylpyrrolidium with bis(trifluoromethylsulfonyl) imide anion and phosphonium-based ionic liquids tetrabutylphosphonium with alanate and valinate anions. The effect of increase in alkyl chain length and temperature on normalized polarity ETN, Kamlet-Taft parameters, hydrogen bond donor ability (α), hydrogen bond acceptor ability (β), and polarizability (π) was investigated in the temperature range of 298-353 K. Interestingly, the polarity decreases with temperature in the case of pyridinium- and pyrrolidinium-based ionic liquids, and it increases with temperature in the case of phosphonium-based ionic liquids.

Item Type:Article
Source:Copyright of this article belongs to American Chemical Society.
ID Code:1561
Deposited On:05 Oct 2010 17:47
Last Modified:17 May 2011 14:30

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