中文摘要：

以三苯胺或硝基苯为端基,合成了三个卟啉多枝分子：5-（4-硝基苯甲酰氧基）苯基-10,15,20-三-（4-溴苯基）卟啉（TPP-NO2）、5-（4-硝基苯甲酰氧基）苯基-10,15,20-三-（4-二苯胺基-1-苯乙烯基）苯基卟啉（TPP-X3）和5,10,15,20-四-（4-二苯胺基-1-苯乙烯基）苯基卟啉（TPP-X4）,进行了红外光谱、核磁共振光谱和质谱表征.比较研究了分子“枝”、“核”不同键合方式与不同对称结构对分子的线性光谱、非线性光谱以及分子内能量转移行为的影响.在钛宝石激光器（800 nm）和Nd∶YAG倍频光（532 nm）泵浦下,样品溶液均发出卟啉环特有的红色荧光--前者系双光子吸收机制“上转换”荧光,后者则为双光子吸收与分子内能量转移机制“下转换”荧光.飞秒Z-scan技术测得样品双光子吸收截面最大可达130 GM,与四苯基卟啉（TPP）同等测试条件下的双光子吸收截面相比增大了两个数量级.

英文摘要：

Three new multibranched porphyrins： 5-（4-nitrobenzoxy）-phenyl-10,15,20-tris-（4-bromo- phenyl）-porphyrin （TPP-NO2）, 5-（4-nitrobenzoxy）-phenyl- 10,15,20-tris-（4-N,N-diphenylamino-styryl）- phenyl-porphyrin （TPP-X3） and 5,10,15,20-tetra-（4-N,N-diphenylamino-styryl）-phenyl-porphyrin （TPP-X4） were synthesized and characterized by IR, 1H NMR and MS measurements, respectively. Pumped by 800 nm and 532 nm laser pulses, respectively, the sample solution could emit strong up- and down-conversion fluorescence, wherein the former cound be interpreted by two-photon absorption （TPA） mechanism and the latter was attributed to two-photon absorption and intramolecular energy transfer. TPA cross-section was measured by femtosecond Z-scan technique at 800 nm Ti ＂ sapphire laser. It was found that TPA cross-section of multibranched porphyrins was enhanced by larger dipole moment difference between the ground- and the excited-state, that is, I6｜△μge｜ value, and stronger conjugation effect, that is, π-π conjugation, between porphyrin ＂core＂ and branches linked to the porphyrin periphery.