Room-temperature phosphorescence of 2,2′-biquinoline in polymeric matrices

Abstract

An original and very strong long-lived emission of 2,2'-biquinoline is observed in hydrogen-bonded polymeric matrices only. This long-lived emission (T o = 1 s) is ascribed to room-temperature phosphorescence (RTP) because of the large value of the decay time, the temperature-dependence, and the polarization results. The existence of hydrogen-bonded complexes in the ground state is assumed to be the origin of the RTP. They involve changes in the conformation of the 2,2'-biquinoline.

Dual Fluorescence of 2-(4′-N,N-dimethylaminophenyl)pyrido [3,4-d]imidazole in a TritonX-100/n-Hexanol/Water Reverse Micelle in Cyclohexane: Effect of pH and Trifluoroacetic Acid

“…Thus, the TICT emission, which is very sensitive to the environment, makes the TICT fluorophore a potent fluorescence probe. The TICT emission in the reverse micelle is scarcely reported and the reverse micelles used are the ionic reverse micelles, e.g., Aerosol-OT (AOT)/decane/water (18) and cetyltrimethyl ammonium bromide (CTAB)/1-heptanol/water (19), where a counterion may interact with the TICT molecule.…”