Ordering and Nonideality of Air-Ionic Liquid Interfaces in Surface Second Harmonic Generation

• Tipo: Artigo em Revista Científica Internacional
• Data: 2020

Autores

Costa, R (Autor) FCUP; Carlos M Pereira (Autor) FCUP; Silva, F (Autor) FCUP; Brevet, PF (Autor) Outra; Benichou, E (Autor) Outra

Revista

Título: Journal of Physical Chemistry B

Vol. 124

Páginas: 3954-3961

ISSN: 1520-6106

Editora: American Chemical Society

Indexação

ISI Web of Knowledge - 10 Citações

Scopus - 11 Citações

Outras Informações

ID Authenticus: P-00S-4T3

DOI: 10.1021/acs.jpcb.9b12025

Abstract (EN): The air-ionic liquid interface for a series of ionic liquids involving imidazolium cations [C(n)mim] with different alkyl chain lengths (n = 2, 4, 6, 8, 10, and 12) and the same [NTf2] imide anion has been studied by polarization-resolved second harmonic generation (SHG). An increase as a function of the alkyl chain length of the orientational parameter reveals the increasing ordering of the air-pure ionic liquid interfaces although it is not possible to disentangle the change in mean tilt angle from a change in the tilt angle probability distribution width. Besides, the study of the air-mixed ([C(12)mim])(x)([C(2)mim])(1-x)[NTf2] ionic liquid interface clearly demonstrates the interfacial nonideality of the mixed ionic liquids. The long alkyl chain cation perturbs the interface as seen from the orientational parameter and displaces the short alkyl chain one for bulk mixture contents as low as 10%. At higher long alkyl chain cation bulk mixture contents, the interface behaves close to a pure long alkyl chain ionic liquid.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 8