空心酞菁光物理性质的取代基效应

合成了一系列可溶性的2，9，16，23-四取代的空心酞菁，并研究了其光物理性质，实验表明，烷基、烷氧基、芳氧基取代空心酞菁的最低电子跃迁能和最低激发单重态能量与Hammett间位取代基常数线性相关．而强吸电子基如硝基和强给电子基如氨基取代则会诱导分子内电荷转移和使酞菁聚集，导致吸收光谱畸变和激发态量子产率下降．但取代基对酞菁的振动能级没有影响．

Substituent Dependence of Photophysical Properties for Free-base Phthalocyanines

A series of soluble 2,9,16,23-tetrasubstituted free-base phthalocyanineswere synthesized and studied spectroscopically. The lowest electronic transition energy and the lowest excited singlet state energy of the phthalocyanines substitutedwith alkyl, alkoxy and aryloxy groups can be correlated well with the Hammett'smeta-directing group effect. While the strong electron-withdrawing group (nitro) andthe strong electron-donating group (amino) may induce intense intramolecular charge-transfer which results in the formation of aggregates, marked distortion of the absorption spectra and quenching of the excited states. However, all the substituents haveless influence on the vibrational level.