Pressurizing the mixtures of two ionic liquids: Crystallization versus vetrification

被引：9

作者：

Capitani, F. ^{[1
]}

Trequattrini, F. ^{[2
,3
]}

Palumbo, O. ^{[3
]}

Roy, P. ^{[1
]}

Postorino, P. ^{[2
]}

Paolone, A. ^{[3
]}

机构：

[1] Synchrotron SOLEIL, F-91192 Gif Sur Yvette, France

[2] Sapienza Univ Roma, Dipartimento Fis, Piazzale A Moro 5, I-00185 Rome, Italy

[3] UOS La Sapienza, CNR ISC, Piazzale A Moro 5, I-00185 Rome, Italy

来源：

JOURNAL OF RAMAN SPECTROSCOPY | 2017年 / 48卷 / 12期

关键词：

high pressure; Ionic liquids; mixtures; RAMAN SPECTRAL CHANGES; PHASE-TRANSITIONS; ROOM-TEMPERATURE; 1-BUTYL-3-METHYLIMIDAZOLIUM HEXAFLUOROPHOSPHATE; AMMONIUM TETRAFLUOROBORATE; BIS(TRIFLUOROMETHANESULFONYL)IMIDE; SOLIDIFICATION; BEHAVIOR; POLYMORPHISM; CONFORMERS;

D O I：

10.1002/jrs.5257

中图分类号：

O433 [光谱学];

学科分类号：

0703 ; 070302 ;

摘要：

A series of mixtures prepared with different content of the ionic liquids N-trimethyl-N-propylammonium bis(trifluoromethylsulfonyl)imide (TMPA-TFSI) and N-trimethyl-N-hexylammonium bis(trifluoromethylsulfonyl)imide (TMHA-TFSI), namely, (TMPA-TFSI)(100-x) (TMHA-TFSI)(x), is investigated by means of Raman spectroscopy as a function of pressure at room temperature. Both pure TMPA-TFSI and the x=2 mixture crystallize under an applied pressure lower than 1GPa. On the contrary, for x>7, none of the investigated mixtures crystallize, but they undergo a glass transition over the 1-2GPa pressure range. We suggest that the disorder induced by the high number of possible configurations for the longer alkyl chain of TMHA-TFSI in a compressed environment is a key factor in the suppression of the crystallization process.

引用

页码：1819 / 1827

页数：9

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Armand M, 2009, NAT MATER, V8, P621, DOI [10.1038/NMAT2448, 10.1038/nmat2448]

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