Divergent trend in density versus viscosity of ionic liquid/water mixtures: a molecular view from guanidinium ionic liquids

Physical Chemistry Chemical Physics : PCCP
Akhil Pratap SinghSanjib Senapati

Abstract

Ionic liquids (ILs) have shown great potential in the dissolution and stability of biomolecules when a low-to-moderate quantity of water is added. Hence, determining the thermophysical properties and understanding these novel mixtures at the molecular level are of both fundamental and practical importance. In this context, here we report the synthesis of two nontoxic guanidinium cation based ILs, tetramethylguanidinium benzoate [TMG][BEN] and tetramethylguanidinium salicylate [TMG][SAL], and present a detailed comparison of their thermophysical properties in the presence of water. The results show that the [TMG][SAL]/water mixtures have higher density and higher apparent molar volume, but a lower viscosity and higher compressibility than the [TNG][BEN]/water mixtures. The measured viscosity and compressibility data are explained from ab initio quantum mechanical calculations and liquid-phase molecular dynamics simulations, where salicylate anions of denser [TMG][SAL]/water were found to exist as isolated ions due to intramolecular H-bonding. On the contrary, intermolecular H-bonding among the benzoate anions and their strong tendency to form an extended H-bonding network with water made [TMG][BEN]/water solutions more viscous a...Continue Reading

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Citations

Feb 26, 2016·Soft Matter·Debostuti Ghoshdastidar, Sanjib Senapati
Mar 10, 2017·Soft Matter·Akhil Pratap SinghSanjib Senapati
Sep 21, 2017·Physical Chemistry Chemical Physics : PCCP·Akhil Pratap SinghSanjib Senapati
Oct 17, 2017·Faraday Discussions·Douglas R MacFarlaneJennifer M Pringle
Oct 10, 2018·Chemical Society Reviews·Chunyan MaXiaoyan Ji
Jul 10, 2019·Frontiers in Chemistry·José M S S EsperançaLuis Paulo N Rebelo
Apr 30, 2021·The Journal of Physical Chemistry. B·Mohammad Homaidur Rahman, Sanjib Senapati
Dec 12, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Soumik BardhanSanjib Senapati
Sep 28, 2017·The Journal of Physical Chemistry. B·Somenath PandaRamesh L Gardas
Nov 27, 2018·The Journal of Physical Chemistry. B·Mohammad Homaidur Rahman, Sanjib Senapati

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