取代基对卟啉三阶光学非线性及弛豫过程的影响

研究了取代基对卟啉三阶光学非线性和激发态弛豫过程的影响，发现在同一取代位置，推电子基团取代使得卟啉三阶光学非线性极化纱数Ｘ值相对影响，而吸电子基团取代使得卟啉Ｘ值相对减少，对同一取代基在不同取代装置，发现推电子基团在邻位取代的Ｘ值大于其在对位取代卟啉的Ｘ值，而吸电子基团在邻位取代的Ｘ值小于其在对位取代卟啉的Ｘ值，另外，还发现推电子基团取代的卟啉弛豫过程比吸电子基团取代的卟啉弛豫过程快７倍。

Substituent Effect on the Third-Order Optical Nonlinear Properties and the Excited State Relaxation Processes in Porphyrins

Substituent effect on the thirdpe order optical nonlinear properties and their excited state relaxation processes in porphyrins have been studied. In the samereplacement on phenyl of tetraphenylporphyin, we discovered that the X(3) value of H2TPP increased with donating electron group and decreased with withdrawing electron group relative to that of free base H2TPP. As the same substituent at different bearing on phenyl of tatraphenylporphyring, the X(3) value of H2TPP with donating electron group at ortho place is parger than at para place, but the X(3) value of H2TPP with withdrawing electron group at ortho place is less than that at para place. Moreover, We found that the relaxation time of H2TPP with donating electron group is about 7 times faster than that with withdrawing electron group.