Nanostructure of mixtures of protic ionic liquids and lithium salts: effect of alkyl chain length

  1. Méndez-Morales, Trinidad 12345
  2. Carrete, Jesús 12345
  3. Rodríguez, Julio R. 12345
  4. Cabeza, Óscar 5910
  5. Gallego, Luis J. 12345
  6. Russina, Olga 678
  7. Varela, Luis M. 12345
  1. 1 Grupo de Nanomateriais e Materia Branda
  2. 2 Departamento de Física da Materia Condensada
  3. 3 Universidade de Santiago de Compostela
    info

    Universidade de Santiago de Compostela

    Santiago de Compostela, España

    ROR https://ror.org/030eybx10

  4. 4 Santiago de Compostela
  5. 5 Spain
  6. 6 Department of Chemistry
  7. 7 Sapienza University
  8. 8 Theological University of Northern Italy
    info

    Theological University of Northern Italy

    Turín, Italia

    ROR https://ror.org/01j6qvh40

  9. 9 Facultade de Ciencias
  10. 10 Universidade da Coruña
    info

    Universidade da Coruña

    La Coruña, España

    ROR https://ror.org/01qckj285

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Journal:
Physical Chemistry Chemical Physics

ISSN: 1463-9076,  1463-9084

Year of publication: 2015

Volume: 17

Issue: 7

Pages: 5298-5307

Type: Article

DOI: 10.1039/C4CP04668D GOOGLE SCHOLAR lock_openOpen access editor

More publications in: Physical Chemistry Chemical Physics

Abstract

The bulk structure of mixtures of two protic ionic liquids, propylammonium nitrate and butylammonium nitrate, with a salt with a common anion, is analyzed at room temperature by means of small angle X-ray scattering and classical molecular dynamics simulations. The study of several structural properties, such as density, radial distribution functions, spatial distribution functions, hydrogen bonds, coordination numbers and velocity autocorrelation functions, demonstrates that increasing the alkyl chain length of the alkylammonium cation results in more segregated, better defined polar and apolar domains, the latter having a larger size. This increase, ascribed to the erosion of the H-bond network in the ionic liquid polar regions as salt is added, is confirmed by means of small angle X-ray scattering measurements, which show a clear linear increase of the characteristic spatial sizes of the studied protic ionic liquids with salt concentration, similar to that previously reported for ethylammonium nitrate (J. Phys. Chem. B, 2014, 118, 761–770). In addition, larger ionic liquid cations lead to a lower degree of hydrogen bonding and to more sparsely packed three-dimensional structures, which are more easily perturbed by the addition of lithium salts

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