以3,5-二溴-2-羟基苯甲醛和1,2-二氨基乙烷、3-氨基苯甲酸为原料,合成了两种化合物N,N′-双3,5-二溴-2-羟基苯甲醛缩1,2-二氨基乙烷(DBSE)和N-3,5-二溴-2-羟基苯甲醛缩3-氨基苯甲酸(DBSA)。利用核磁共振氢谱、质谱、红外光谱和元素分析对目标化合物的结构进行了表征,通过紫外-可见吸收光谱、荧光光谱测定了其发光性能,另外通过TG-DTG测定了其热稳定性能。结果表明：目标化合物DBSE为蓝绿光发射,DB-SA为紫色光发射；目标化合物的热分解温度均达260℃以上,具有良好的热稳定性；在254 nm紫外光照射不同时间下、不同的温度下、不同的极性溶剂中、不同浓度的Co2+离子滴定的情况中,目标化合物均表现出了一定的变色发光性能,整体来看DBSE的光致变色性能优于DBSA,而热致变色性能DBSA优于DBSE。%Condensation of 1,2-diaminoethane and 3-aminobenzoic acid with 3,5-dibromo-2-hydroxybenzaldehyde respectively yiel-ded two target compounds,from N,N-ethylene-bis(3,5-dibromosalicylideneimine) ( DBSE) and N-3,5-dibromine-salicylaldehyde-m-aminobenzoic acid( DBSA) . The compounds had been characterized by elemental analysis, MS, IR and 1 H NMR spectra. The thermal stability of compounds were investigated and the TG-DTG showed that the compounds had better performance in thermal stability and the decomposition temperature( Td ) were all up to 260℃. Furthermore,the luminescent properties were evaluated by UV-Visible absorption spectrum and fluorescence spectrum. DBSE was blue-green luminescence and DBSA was violet lumines-cence. The results also indicated that the target compounds exhibited certain photochromic and thermochromic properties under the conditions of 254 nm UV light and different temperatures;the different polar solvents and different concentrations of Co2+ion were also influenced on the luminescent properties. In general,the photochromic property of DBSE was superior to DBSA,but the thermo-chromic property was opposite.
展开▼
