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合成了具有不同数目的对氨基苯基取代的卟吩衍生物,其中包括5-(对-氨苯基)-10,15,20-三苯基卟吩,5,10-二(对-氨苯基)-15,20-二苯基卟吩,5,15-二(对-氨苯基)-10,20-二苯基卟吩;5,10,15-三(对-氨苯基)-20-苯基卟吩和5,10,15,20-四(对-氨苯基)卟吩等,并对它们的电子吸收和发射光谱以及荧光寿命进行了测量,所得实验结果表明:由取代基引起的分子对称性的改变对它们的光谱和动态特性有一定的影响,分子对称性降低时,可使吸收振子强度增大和荧光衰变过程加速,这一效应对对称禁戒的A_(1g)-B_(2u)和A_(1g)-B_(3u)的电子跃迁的影响尤为显著,这一发现启发了人们,即使是和发色基相互作用不大的基团中的非对称取代也有可能使电子跃迁的对称性禁戒松弛。
Porphine derivatives having a different number of p-aminophenyl substitutions were synthesized, including 5- (p-aminophenyl) -10,15,20-triphenylporphin, 5,10-di Phenyl) -15,20-diphenylporphin, 5,15-bis (p-aminophenyl) -10,20-diphenylporphin; 5,10,15-tris ) -20-phenyl-porphine and 5,10,15,20-tetrakis (p-aminophenyl) porphyrin were synthesized and their electronic absorption and emission spectra and fluorescence lifetime were measured. The experimental results show that: The molecular symmetry changes caused by the substituent have some influence on their spectral and dynamic properties. When the molecular symmetry decreases, the intensity of the absorbing vibrator and the fluorescence decay process can be accelerated. 1g) -B_ (2u) and A_ (1g) -B_ (3u) is particularly significant, this finding inspired people, even if the asymmetric substitution of the group with little chromophore interaction It is also possible to forbid relaxation of the symmetry of the electronic transition.