Hydrogen Bond Kinetics, Ionic Dynamics, and Voids in the Binary Mixtures of Protic Ionic Liquids with Alkanolamines

Reddy, Th Dhileep N. and Mallik, Bhabani S. (2021) Hydrogen Bond Kinetics, Ionic Dynamics, and Voids in the Binary Mixtures of Protic Ionic Liquids with Alkanolamines. The Journal of Physical Chemistry B, 125 (21). pp. 5587-5600. ISSN 1520-6106

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Abstract

Classical molecular dynamics simulations were used to investigate the structural and dynamical properties of the mixtures of ionic liquids (ILs) with the conjugate forms of the cation in a 1:1 molar ratio. The experimental studies suggested the combination of ethanolamines and ILs as novel absorbents for acidic gases such as CO2 and H2S, which provide the advantage of efficient absorption of gases at low pressures. However, the microscopic properties of the ionic mixtures are not studied. From our computational investigations, the densities of mixtures are reported and compared with the experimental results. The structural evolution of mixtures is reported by radial distribution functions, coordination numbers, void analysis, and spatial distribution functions. The mixtures' dynamic properties were studied by analyzing the hydrogen bond, ion-pair, and ion-cage lifetimes of the system. Monoethanolammonium and triethanolammonium ILs show different types of spatial distribution functions. The cations have lesser effect on dynamics compared with anions. The charge on the anion greatly affects the dynamics of mixtures. The dianion mixtures show slower dynamics than the monoanionic mixtures. The hydrogen bonding between cations and anions is stronger than that between cations and neutral molecules due to strong coulombic attractive forces. The cations spend more time around the dianions as compared to monoanions. The distributions of voids show that the void sizes are smaller in triethanolamine-based mixtures. The sulfobenzoate-based mixtures show voids smaller than those of pyridine-3-carboxylate-based mixtures due to more available free space between the entities, which facilitates the overall dynamics.

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IITH Creators:

IITH Creators	ORCiD
Reddy, Th Dhileep N.	UNSPECIFIED
Mallik, Bhabani Shankar	http://orcid.org/0000-0001-9657-1497

Item Type:

Article

Uncontrolled Keywords:

Classical molecular dynamics; Computational investigation; Coordination number; Dynamical properties; Microscopic properties; Protic ionic liquids; Radial distribution functions; Structural evolution Engineering main heading;Alkanolamines; Carboxylation; Distribution functions; Ethanolamines; Hydrogen bonds; Hydrogen sulfide; Ionic liquids; Molar ratio; Molecular dynamics; Negative ions; Positive ions; Spatial distribution; Triethanolamine

Subjects:

Chemistry

Divisions:

Department of Chemistry

Depositing User:

. LibTrainee 2021

Date Deposited:

30 Jun 2021 08:59

Last Modified:

30 Jun 2021 08:59

URI:

http://raiithold.iith.ac.in/id/eprint/8062