Synthesis And Properties Of Fluorescent Photochromic Bisthienylethene Compounds

Among various organic photochromic systems, bisthienylethene (BTE) derivatives areone of the hottest topics owing to their high potential application value in erasable andrewritable optical information storage, molecular logic circuit, light-control ion recognization,biological fluorescent probe and so on. In this thesis, some new bisthienylethene compoundswere designed and synthesized, and their applications in the detection of Hg2+, ClO–, aminoacids, fluorescent molecular switches, optical data storage were investigated. The maincontents and conclusions are as follows:1. A new photochromic bisthienylethene compound containing rhodamine fluorophoreswas designed and synthesized. Its photochromic behaviors and selective response to Hg2+were investigated. Based on its unique properties, a multi-function molecular switch was builtunder the stimulation of UV/Vis light and Hg2+. Moreover, the compound can successfullydetect the trace amounts of Hg2+in living cells.2. Two novel photochromic bisthienylethene derivatives containing fluorescein unitswere designed and characterized. Their photochromic properties in solution, response andselective to ClO–are studied. Their own fluorescent characteristics are moderated by UV lightand ClO–. Thus, two multi-function fluorescent probes were developed.3. A D-π-2A photochromic bisthienylethene compound was designed and fullycharactered. Its photochromic and fluorescent switch properties were studied by UV-vis andfluorescent methods. Under the promotion of UV light, the compound can selectivelyrecognize L-cysteine and DL-homocysteine, which demonstrated that it can be served as anexcellent amino acid colorimetric sensor.4. The photochromic behavior of the bisthienylethene compound which containingaldehyde groups was studied and a fluorescent switch system was constructed by mixingrhodamine B and the compound with appropriate doping ratio. The system exhibited excellentfluorescent switch upon UV/visible light irradiation. A simple optical storage device wasdeveloped by doped them in PMMA, which will provide a simple and viable method foroptical data storage based on photochromic fluorescent materials.