Molecular dynamics study of 2-nitrophenyl octyl ether and nitrobenzene

M Jorge, R. Gulaboski, C. M. Pereira, M. Natalia D. S. Cordeiro

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

The pure organic liquids nitrobenzene (NB) and 2-nitrophenyl octyl ether (NPOE) have been studied by means of molecular dynamics simulations. Both solvents are extremely important in various interfacial processes, mainly connected with ion transfer taking place across the interface with water. Thermodynamic (mass density, enthalpy of vaporization, isothermal compressibility, dipole moment) and dynamic (viscosities and self-diffusion coefficients) properties of both liquids have been calculated and are in very good agreement with the experimental data. In the case of NB, several potentials have been tested and the obtained results compared and discussed. In most cases, the OPLS all-atom potential gives results that are in better agreement with available experimental values. Atomic radial distribution functions, dihedral and angle distributions, as well as dipole-orientation correlation functions are used to probe the structure and interactions of the bulk molecules of both organic solvents. These were seen to be very similar in terms of structure and thermodynamics, but quite distinct in terms of dynamic behavior, with NPOE showing a much slower dynamic response than NB. A simulation study of the simple Cl- and K+ ions dissolved in both solvents has been also undertaken, revealing details about the diffusion and solvation mechanisms of these ions. It was found that in both liquids the positive potassium ion is solvated by the negative end of the molecular dipole, whereas the negative chloride ion is solvated by the positive end of the dipole.

LanguageEnglish
Pages12530-12538
Number of pages9
JournalJournal of Physical Chemistry B
Volume110
Issue number25
Early online date6 Jun 2006
DOIs
Publication statusPublished - 29 Jun 2006

Fingerprint

Nitrobenzene
nitrobenzenes
Molecular dynamics
Ethers
ethers
Ions
molecular dynamics
dipoles
ions
Liquids
Thermodynamics
thermodynamics
organic liquids
Solvation
Dipole moment
liquids
dynamic response
Compressibility
Vaporization
radial distribution

Keywords

  • pure organic liquids
  • molecular dynamics simulations
  • solvents
  • thermodynamics

Cite this

Jorge, M ; Gulaboski, R. ; Pereira, C. M. ; Cordeiro, M. Natalia D. S. / Molecular dynamics study of 2-nitrophenyl octyl ether and nitrobenzene. In: Journal of Physical Chemistry B. 2006 ; Vol. 110, No. 25. pp. 12530-12538.
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Molecular dynamics study of 2-nitrophenyl octyl ether and nitrobenzene. / Jorge, M ; Gulaboski, R.; Pereira, C. M. ; Cordeiro, M. Natalia D. S.

In: Journal of Physical Chemistry B, Vol. 110, No. 25, 29.06.2006, p. 12530-12538.

Research output: Contribution to journalArticle

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AU - Jorge, M

AU - Gulaboski, R.

AU - Pereira, C. M.

AU - Cordeiro, M. Natalia D. S.

N1 - This document is the unedited Author’s version of a Submitted Work that was subsequently accepted for publication in Journal of Physical Chemistry B, copyright © American Chemical Society after peer review. To access the final edited and published work see http://pubs.acs.org/doi/abs/10.1021/jp061301j.

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N2 - The pure organic liquids nitrobenzene (NB) and 2-nitrophenyl octyl ether (NPOE) have been studied by means of molecular dynamics simulations. Both solvents are extremely important in various interfacial processes, mainly connected with ion transfer taking place across the interface with water. Thermodynamic (mass density, enthalpy of vaporization, isothermal compressibility, dipole moment) and dynamic (viscosities and self-diffusion coefficients) properties of both liquids have been calculated and are in very good agreement with the experimental data. In the case of NB, several potentials have been tested and the obtained results compared and discussed. In most cases, the OPLS all-atom potential gives results that are in better agreement with available experimental values. Atomic radial distribution functions, dihedral and angle distributions, as well as dipole-orientation correlation functions are used to probe the structure and interactions of the bulk molecules of both organic solvents. These were seen to be very similar in terms of structure and thermodynamics, but quite distinct in terms of dynamic behavior, with NPOE showing a much slower dynamic response than NB. A simulation study of the simple Cl- and K+ ions dissolved in both solvents has been also undertaken, revealing details about the diffusion and solvation mechanisms of these ions. It was found that in both liquids the positive potassium ion is solvated by the negative end of the molecular dipole, whereas the negative chloride ion is solvated by the positive end of the dipole.

AB - The pure organic liquids nitrobenzene (NB) and 2-nitrophenyl octyl ether (NPOE) have been studied by means of molecular dynamics simulations. Both solvents are extremely important in various interfacial processes, mainly connected with ion transfer taking place across the interface with water. Thermodynamic (mass density, enthalpy of vaporization, isothermal compressibility, dipole moment) and dynamic (viscosities and self-diffusion coefficients) properties of both liquids have been calculated and are in very good agreement with the experimental data. In the case of NB, several potentials have been tested and the obtained results compared and discussed. In most cases, the OPLS all-atom potential gives results that are in better agreement with available experimental values. Atomic radial distribution functions, dihedral and angle distributions, as well as dipole-orientation correlation functions are used to probe the structure and interactions of the bulk molecules of both organic solvents. These were seen to be very similar in terms of structure and thermodynamics, but quite distinct in terms of dynamic behavior, with NPOE showing a much slower dynamic response than NB. A simulation study of the simple Cl- and K+ ions dissolved in both solvents has been also undertaken, revealing details about the diffusion and solvation mechanisms of these ions. It was found that in both liquids the positive potassium ion is solvated by the negative end of the molecular dipole, whereas the negative chloride ion is solvated by the positive end of the dipole.

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