Highly Luminescent and Color‐Tunable Salicylate Ionic Liquids

Abstract

High quantum yields of up to 40.5% can be achieved in salicylate-bearing ionic liquids. A range of these ionic liquids have been synthesized and their photoluminescent properties studied in detail. The differences noted can be related back to the structure of the ionic liquid cation and possible interionic interactions. It is found that shifts of emission, particularly in the pyridinium-based ionic liquids, can be related to cation-anion pairing interactions. Facile and controlled emission color mixing is demonstrated through combining different ILs, with emission colors ranging from blue to yellow.

Ionic liquid functionalized graphene oxide for enhancement of styrene‐butadiene rubber nanocomposites

“…The spectrum of AMICl shows a steep peak centered at 208 nm, with a long absorption tail apparent far into the visible range of the spectrum. This peak is attributed to the imidazolium π → π* transitions . The spectrum of GO dispersion exhibits two characteristic features: a maximum at 230 nm, corresponding to π → π* transitions of aromatic C–C bonds, and a shoulder around 300 nm, assigned to n → π* transitions of C=O bonds .…”

Effect of counterion on the mesomorphic behavior and optical properties of columnar pyridinium ionic liquid crystals derived from 4-hydroxypyridine

“…9). The luminescence properties were also studied in dichloromethane solution when only one emission band was observed with its maximum located about 320 nm assigned to an intraligand transition which are significantly blueshifted by comparison to solid-state emission spectra recorded in solid, suggesting an aggregate-type emission in solid state [18][19][20].…”

Sodium Salicylate: An In‐Depth Thermal and Photophysical Study

“…This so‐called “antenna effect” leads to markedly brighter and more efficient emission from Tb 3+ , thereby overcoming its poor absorption coefficient/cross‐section due to narrow, parity‐forbidden f–f electronic transitions. We have already reported how sodium salicylate can be used as a reagent towards a new range of ionic liquids exhibiting high intensity photoluminescence, simply by combining this anion with one of a range of well‐known asymmetric organic cations …”

“…We have already reported how sodium salicylate can be used as ar eagent towards an ew range of ionic liquids exhibiting high intensity photoluminescence, simplyb yc ombiningthis anion with one of ar ange of well-known asymmetric organic cations. [11] Despite its wide range of importanta pplicationsa nd relative simplicity,t here appears to be as ubstantial lack of information relating to the physical and chemical behaviour of sodium salicylate.A lbeit being an important API (active pharmaceutical ingredient), there is ad eficiencyo fi nformation on its crystalline form, in stark contrastt oa spirin,a cetylsalicylica cid, for which extensive polymorphismw as predicted and reported. [12][13][14] Astonishingly for sodiums alicylate, no crystal structure is reported, which is due to the fact that growingc rystalso fs alicylates of sufficientq uality is notoriously problematic.T he structures of potassium and rubidium salicylate could be solved from high-resolutionpowderX-ray diffraction data by ab initio structure solution methods.…”