Multiple‐Stimuli Responsive Luminescent Gels Based on Cholesterol Containing Benzothiadiazole Fluorophores

Abstract

Two new fluorescent organogelators based on cholesterol containing benzothiadiazole group have been designed and synthesized. Three methods for gels preparation have been presented, such as heating-cooling process, ultrasonic treatment and mixed solvents under room temperature. For both of the gels, their states and emission colors exhibit striking changes upon addition of Hg 2＋ . The gelation properties, structural characteristics and fluorescence of the gels were studied by FT-IR, UV-Vis absorption and PL spectra. The underlying mechanism of gelation property was studied by X-ray diffraction combined with theoretical calculation, and the important role of π-π interactions in forming the gels has been proved.

Multiple Stimuli-Responsive Fluorescence Behavior of Novel Polyamic Acid Bearing Oligoaniline, Triphenylamine, and Fluorene Groups

“…Stimuli-responsive fluorescent materials have gained much exposure in recent years due to their potential applications as sensors, bioimaging, memory media, and displays. − Chemical substances, , temperature, light, pH, electricity, and mechanical force are the typical stimuli utilized to change the fluorescent behaviors of these materials. To explore the mechanism of fluorescent switching and impart more functionality, many multiple stimuli-responsive fluorescent materials have been reported. − For example, Huang et al have designed and synthesized two kinds of multiple stimuli-responsive fluorescent gels based on cholesterol-containing benzothiazole fluorophore, which is sensitive to temperature, solvent, ultrasound, and mercury ions. Yan et al have reported a mechanical-induced and solvent stimuli-responsive fluorescent change by assembling niflumic acid into the interlayer region of Zn–Al layered double hydroxides.…”