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Thermal Analysis and Raman Spectra of Different Phases of the Ionic Liquid Butyltrimethylammonium Bis(trifluoromethylsulfonyl)imide

Thermal Analysis and Raman Spectra of Different Phases of the Ionic Liquid Butyltrimethylammonium Bis(trifluoromethylsulfonyl)imide

Luiz F O Faria, Jivaldo R Matos, Mauro C C Ribeiro

J Phys Chem B. 2012 Aug 2;116(30):9238-45.

PMID: 22738441

Abstract:

The ionic liquid butyltrimethylammonium bis(trifluoromethylsulfonyl)imide, [C(4)C(1)C(1)C(1)N][Tf(2)N], is a glass-forming liquid that exhibits partial crystallization depending on the cooling rate. Differential scanning calorimetry (DSC) indicates crystallization at T(c) = 227 K, melting at T(m) = 258 K, glass transition at T(g) ~ 191 K, and also cold crystallization at T(cc) ~ 219 K. Raman spectroscopy shows that the crystalline structure obtained by slow cooling is formed with [Tf(2)N](-) in cisoid conformation, whereas [Tf(2)N](-) in transoid conformation results from fast cooling. No preferred conformation of the butyl chain of the [C(4)C(1)C(1)C(1)N](+) cation is favored by slow or fast cooling of [C(4)C(1)C(1)C(1)N][Tf(2)N]. Low-frequency Raman spectroscopy shows that crystalline domains developing in the supercooled liquid result in a glacial state made of a mixture of crystallites and amorphous phase. However, these crystalline structures obtained by slow cooling or cold crystallization are not the same because anion-cation interactions promote local structures with distinct conformations of the [Tf(2)N](-) anion.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP258273755	Butyltrimethylammonium bis(trifluoromethylsulfonyl)imide		258273-75-5	Price

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