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Structures, intermolecular interactions, and chemical hardness of binary water–organic solvents: a molecular dynamics study

  • Sonia M. Aguilera-Segura
  • Francesco Di Renzo
  • Tzonka Mineva
Original Paper
Part of the following topical collections:
  1. International Conference on Systems and Processes in Physics, Chemistry and Biology (ICSPPCB-2018) in honor of Professor Pratim K. Chattaraj on his sixtieth birthday

Abstract

The evolution of structural properties, thermodynamics and averaged (dynamic) total hardness values as a function of the composition of binary water–organic solvents, was rationalized in view of the intermolecular interactions. The organic solvents considered were ethanol, acetonitrile, and isopropanol at 0.25, 0.5, 0.75, and 1 mass fractions, and the results were obtained using molecular dynamics simulations. The site-to-site radial distribution functions reveal a well-defined peak for the first coordination shell in all solvents. A characteristic peak of the second coordination shell exists in aqueous mixtures of acetonitrile, whereas in the water–alcohol solvents, a second peak develops with the increase in alcohol content. From the computed coordination numbers, averaged hydrogen bonds and their lifetimes, we found that water mixed with acetonitrile largely preserves its structural features and promotes the acetonitrile structuring. Both the water and alcohol structures in their mixtures are disturbed and form hydrogen bonds between molecules of different kinds. The dynamic hardness values are obtained as the average over the total hardness values of 1200 snapshots per solvent type, extracted from the equilibrium dynamics. The dynamic hardness profile has a non-linear evolution with the liquid compositions, similarly to the thermodynamic properties of these non-ideal solvents.

Graphical abstract

Computed dynamic total hardness, as a function of the cosolvent mass fraction for water–ethanol (EtOH), water–isopropanol (2PrOH) and water–acetonitrile (AN)

Keywords

Binary water-organic solvent Molecular dynamics simulations Radial distribution function Hydrogen bond Dynamic chemical hardness 

Notes

Acknowledgments

This work was granted access to the HPC resources of [CCRT/CINES/IDRIS] under the allocation 2017 [×2017087369] made by GENCI (Grand Equipement National de Calcul Intensif] and was partially funded through the ENSCM SINCHEM EMJD PhD grant. SINCHEM is a Joint Doctorate programme selected under the Erasmus Mundus Action 1 Programme (FPA 2013-0037).

Supplementary material

894_2018_3817_MOESM1_ESM.pdf (965 kb)
ESM 1 (PDF 964 kb)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Matériaux Avancés pour la Catalyse et la Santé, UMR 5253 CNRS/UM/ENSCMInstitut Charles Gerhardt de Montpellier (ICGM)Montpellier cedex 5France

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