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Open AccessFeature PaperArticle

Molecular Assembling in Mixtures of Hydrophilic 1-Butyl-1-Methylpyrrolidinium Dicyanamide Ionic Liquid and Water

1
Consiglio Nazionale delle Ricerche—Istituto dei Sistemi Complessi, U.O.S. La Sapienza, Piazzale A. Moro 5, 00185 Roma, Italy
2
Dipartimento di Fisica, Sapienza Università di Roma, Piazzale A. Moro 5, 00185 Roma, Italy
3
Synchrotron SOLEIL, L’Orme des Merisiers Saint-Aubin, BP 48 91192 Gif-sur-Yvette CEDEX, France
*
Author to whom correspondence should be addressed.
Appl. Sci. 2020, 10(14), 4837; https://doi.org/10.3390/app10144837
Received: 12 June 2020 / Revised: 7 July 2020 / Accepted: 11 July 2020 / Published: 14 July 2020
(This article belongs to the Special Issue Self-Assembly in Chemistry and Supramolecular Chemistry)
The infrared absorbance spectrum of the ionic liquid 1-butyl-1-methylpyrrolidinium dicyanamide, mixed with water at two different concentrations, was measured between 160 and 300 K in the mid infrared range. Both mixtures do not crystallize on cooling; however, remarkably, the one with an ionic liquid (IL):water composition of 1:3 displays a cold crystallization process on heating in a restricted temperature range between 240 and 250 K. A portion of the water participates to the cold crystallization. On the contrary, with an IL:water composition of 1:6.6 no crystallization takes place. Upon water addition the vibration frequencies of the anion and of some lines of the cation are blue shifted, while the absorption lines of water are red shifted. These facts are interpreted as the evidence of the occurrence of the hydrogen bonding of water, as the hydrogen bonding acceptor with respect to the anion (anion∙∙∙O-H bonds develop) and as hydrogen donor for the cation (C-H∙∙∙O bonds can form). Microscopic inhomogeneities in the samples and their evolution with temperature are discussed. View Full-Text
Keywords: ionic liquid; water; mixtures; infrared spectroscopy; molecular interactions; hydrogen bonding; microscopic inhomogeneities ionic liquid; water; mixtures; infrared spectroscopy; molecular interactions; hydrogen bonding; microscopic inhomogeneities
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MDPI and ACS Style

Palumbo, O.; Trequattrini, F.; Brubach, J.-B.; Roy, P.; Paolone, A. Molecular Assembling in Mixtures of Hydrophilic 1-Butyl-1-Methylpyrrolidinium Dicyanamide Ionic Liquid and Water. Appl. Sci. 2020, 10, 4837. https://doi.org/10.3390/app10144837

AMA Style

Palumbo O, Trequattrini F, Brubach J-B, Roy P, Paolone A. Molecular Assembling in Mixtures of Hydrophilic 1-Butyl-1-Methylpyrrolidinium Dicyanamide Ionic Liquid and Water. Applied Sciences. 2020; 10(14):4837. https://doi.org/10.3390/app10144837

Chicago/Turabian Style

Palumbo, Oriele; Trequattrini, Francesco; Brubach, Jean-Blaise; Roy, Pascale; Paolone, Annalisa. 2020. "Molecular Assembling in Mixtures of Hydrophilic 1-Butyl-1-Methylpyrrolidinium Dicyanamide Ionic Liquid and Water" Appl. Sci. 10, no. 14: 4837. https://doi.org/10.3390/app10144837

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