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Characterization of a Novel Intrinsic Luminescent Room‐Temperature Ionic Liquid Based on [P 6,6,6,14 ][ANS]
Author(s) -
Delgado Joana M.,
Raymundo Anabela,
Vilarigues Márcia,
Branco Luís C.,
Laia César A. T.
Publication year - 2015
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201402534
Subject(s) - ionic liquid , luminescence , ion , fluorescence , viscosity , sulfonate , materials science , ionic bonding , relaxation (psychology) , glass transition , stokes shift , rheology , analytical chemistry (journal) , chemical physics , chemistry , polymer , organic chemistry , optics , optoelectronics , sodium , social psychology , psychology , metallurgy , physics , composite material , catalysis
Intrinsically luminescent room‐temperature ionic liquids (RTILs) can be prepared by combining a luminescent anion (more common) or cation with appropriate counter ions, rendering new luminescent soft materials. These RTILs are still new, and many of their photochemical properties are not well known. A novel intrinsic luminescent RTIL based on the 8‐anilinonaphthalene‐1‐sulfonate ([ANS]) anion combined with the trihexyltetradecylphosphonium ([P 6,6,6,14 ]) cation was prepared and characterized by spectroscopic techniques. Detailed photophysical studies highlight the influence of the ionic liquid environment on the ANS fluorescence, which together with rheological and 1 H NMR experiments illustrate the effects of both the viscosity and electrostatic interactions between the ions. This material is liquid at room temperature and possesses a glass transition temperature ( T g ) of 230.4 K. The fluorescence is not highly sensitive to factors such as temperature, but owing to its high viscosity, dynamic Stokes shift measurements reveal very slow components for the IL relaxation.