光致变色水杨醛缩胺类Schiff碱的荧光性质

Fluorescence of Photochromic Salicylaldehyde-Derived Schiff Bases

测定了双水杨醛缩邻苯二胺 ( 1 )、缩对苯二胺 ( 2 )、缩 1 ,2 -环己二胺 ( 3)、缩乙二胺 ( 4)、缩 1 ,6-己二胺( 5)和水杨醛缩α-苯乙胺 ( 6)在溶液中以及固态时的荧光光谱 ,研究了 Schiff碱 1 ,3,4 ,5和 6在固态和溶液中的光致变色行为 .

The luminescence and photochromism of a series of six salicylaldehyde-derived Schiff base in solution and solid state were investigated by fluorescence spectroscopy 2,2-[1,2-phenylenebis(nitrilomethylidyne)]bisphenol(1); 2,2-[1,4-phenylenebis(nitrilomethylidyne)]bis-phenol(2); 2,2-[1,2-cyclohexanediylbis(nitrilomethylidyne)]bisphenol(3); 2,2-[1,2-ethane diylbis(nitrilomethylidyne)]bisphenol(4); 2,2-[1,6-hexanediylbis(nitrilomethylidyne)]bisphenol(5); 2-{[(1-phenylethyl)imino]methylidynephenol}(6). The experimental results show that the fluorescence intensity of Schiff base 1~6 is related to the structure of the conjugated system or the carbon bridge linking the two fluorophores in the molecules. The time-resolved fluorescence spectroscopy of 1, 3—6 show that they are photochromic in either solution or solid state(2 is known as a thermochromic one). The time course fluorescence spectroscopy show that the “macro-response” of Schiff bases 3, 5 and 6 with irradiation is extremely rapid, especially for 5, of which the fluorescence intensity changed by about 70% within 10 s.