Novel Fluorescent 2-(2-Aminofluorophenyl)benzoxazoles: Syntheses and Photophysical Properties.
Novel Fluorescent 2-(2-Aminofluorophenyl)benzoxazoles: Syntheses and Photophysical Properties.
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新型荧光 2-(2-氨基氟苯基)苯并恶唑：合成和光物理性质。
DOI：
10.1002/chin.200321120
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
T. Komiya
中科院分区：
文献类型：
--
作者：
Kiyoshi Tanaka;T. Komiya
2‐(2‐Amino‐3，4，5，6‐tetrafluorophenyl)benzoxazole(2)在长波(在甲醇溶液中的λ最大吸收波长为346 nm)和正常波长(λ最大吸收波长为285.5 nm)均有吸收，并发出蓝色荧光。发射强度受溶剂极性的影响很大，在甲醇等极性溶剂中发射强度较大。2-(2-五氟苯甲酰胺-3，4，5，6-四氟苯基)苯并恶唑(5)在380 nm附近发出绿色荧光，其相对强度与溶剂的极性有关。绿色荧光在非极性溶剂如氯仿和甲苯中被增强，导致相当大的斯托克斯位移。
2‐(2‐Amino‐3,4,5,6‐tetrafluorophenyl)benzoxazole (2) absorbs in long wavelength band (λabsmax= 346 nm in methanol) and in the normal wavelength band (λabsmax= 285.5 nm), and emits blue fluorescence. The emission intensity is highly affected by the solvent polarity and is large in a polar solvent such as methanol. 2‐(2‐Pentafluorobenzamido‐3,4,5,6‐ tetrafluorophenyl)benzoxazole (5) emits green fluorescence along with the short wavelength emission around 380 nm and their relative intensity depends on the solvent polarity. Green fluorescence is enhanced in nonpolar solvents such as chloroform and toluene, resulting in the considerably large Stokes shift.