Characterization of a Novel Intrinsic Luminescent Room‐Temperature Ionic Liquid Based on [P_6,6,6,14][ANS]

Abstract

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 ([P6,6,6,14 ]) 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 (Tg ) 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.

Naphthalene‐Functionalized, Photoluminescent Room Temperature Ionic Liquids Bearing Small Counterions

“…To solve this problem, bulky counterions were usually selected as it is generally accepted that the melting points of a given ionic liquid (ILs) can be tuned by the size of the counterion . With this method, several π‐conjugated RTILs have been reported where the π‐units were introduced as part of a cation, or anion …”

“…[1][2][3] With this method, several p-conjugated RTILs have been reported where the p-unitsw ere introduced as part of ac ation, [12,[15][16][17][18][19] or anion. [13,14,20] An alternativew ay to lower the melting point of ag iven ionic liquid is to increase the asymmetry of the cation or anion. [21] For this purpose,i ni midazolium-basedI Ls alkyl chainsa re usually attached at 1-and 3-position of the imidazole ring.…”

Photochromic Room Temperature Ionic Liquids Based on Anionic Diarylethene Derivatives

“…[6] In this context, the incorporation of task-specific functionality into ILs, where the desired functional group is covalently tethered to the cation, anion or both became a very attractive approach. [7] Different research groups, including our group already reported several functionalized ILs, containing magnetic, [8][9][10][11] photochromic, [12] electrochromic, [13][14][15] luminescent, [16][17][18][19][20] photo-rheological [21] and energetic properties, [22,23] among others.…”

Gaseous and dissolved oxygen sensing with stabilized pyrene in ionic liquid modified electrospun slides

“…It is known that some of the room temperature ionic liquids (RTILs) have intrinsic Ö TER and SABANCI ŞAHİN/Turk J Chem fluorescence characteristics. 44 Thus, the possible interference of the RTILs on the emission of pyrene dye was also checked. The results showed that the spectral characteristics of the pyrene dye both at 370 and 470 nm were not affected by the ionic liquid.…”