Novel fluorescent 2-(2-aminofluorophenyl)benzoxazoles: Syntheses and photophysical properties
作者:Kiyoshi Tanaka、Tomohiro Komiya
DOI:10.1002/jhet.5570390629
日期:2002.11
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
2-(2-氨基-3,4,5,6-四氟苯基)苯并恶唑(2)在长波长带(在甲醇中λabs max = 346 nm)和正常波长带(λabs max = 285.5 nm)中吸收,并发出蓝色荧光。发射强度受溶剂极性的影响很大,在极性溶剂(如甲醇)中较大。2-(2-五氟苯甲酰胺基-3,4,5,6-四氟苯基)苯并恶唑(5)发出绿色荧光,同时发出约380 nm的短波长,其相对强度取决于溶剂极性。在非极性溶剂(如氯仿和甲苯)中,绿色荧光增强,从而导致相当大的斯托克斯位移。