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Pressurizing the mixtures of two ionic liquids: Crystallization versus vetrification
Author(s) -
Capitani F.,
Trequattrini F.,
Palumbo O.,
Roy P.,
Postorino P.,
Paolone A.
Publication year - 2017
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.5257
Subject(s) - ionic liquid , imide , raman spectroscopy , crystallization , chemistry , glass transition , alkyl , ionic bonding , analytical chemistry (journal) , crystallography , polymer chemistry , organic chemistry , ion , polymer , physics , optics , catalysis
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 1 GPa. On the contrary, for x > 7, none of the investigated mixtures crystallize, but they undergo a glass transition over the 1–2 GPa 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.