Fluorescence modulation in azobenzene-substituted triphenyl pyrazoline derivative

✍ Scribed by Ming Jin; Ran Lu; Chun Yan Bao; Ting Hua Xu; Ying Ying Zhao

• Book ID: 103875931
• Publisher: Elsevier Science
• Year: 2004
• Tongue: English
• Weight: 276 KB
• Volume: 26
• Category: Article
• ISSN: 0925-3467
• DOI: 10.1016/j.optmat.2003.12.011

✦ Synopsis

Triphenyl pyrazoline derivative, 1,3-diphenyl-5-{4-[2-(4-(phenylazo)phenoxy)ethyloxy]phenyl}-2-pyrazoline (compound III), was synthesized and its optical properties were studied by UV-VIS and fluorescence spectroscopies. The UV-VIS spectrum showed that the electronic transition bands of azobenzene and triphenyl pyrazoline groups were overlapped at %350 nm. The fluorescent emission band appeared at 450 nm, which was located at the range of n-p à transition band of azobenzene. It was found that the fluorescence intensity of pyrazoline moiety could be modulated by irradiation with UV and visible light due to the reversible transcis-trans photoisomerization reaction of azobenzene moiety. It indicated that the intramolecular electronic energy transfer from pyrazoline moiety to azobenzene one happened and the degree of energy transfer was determined by the content of cis-isomer of azobenzene moiety.