C60-地塞米松的激光激发

利用激光光解装置检测了C60-地塞米松(C60-DE)的苯溶液在355 nm激光照射下产生的激发三重态, 3C60-DE*出现四个吸收峰, 分别位于700、440、350 和310 nm. 在330 nm处观察到了它的漂白吸收最大值, 这与其基态吸收最大值相对应. 3C60-DE*能够将能量转移给O2分子而淬灭. 与3C60*相比, 3C60-DE*的三重态鄄三重态(T-T)淬灭速率常数减小(3C60*为(5.03±1.31)×109 L·mol-1·s-1, 3C60-DE*为(3.53±0.87)×109 L·mol-1·s-1), 而寿命增加了(3C60*为(12.0±2.6) μs, 3C60-DE*为(18.0±3.3) μs), 这可能是C60分子上连接了地塞米松分子后减小了C60球之间碰撞的几率所致.

Laser Flash Photolysis of C60-dexamethasone

Laser flash photolysis technique was employed to characterize the triplet excited state behavior of C60-dexamethasone (C60-DE) in benzene. The time-resolved triplet-triplet (T-T) difference absorption spectrum of 3C60-DE* with optical excitation (355 nm laser pulse) was recorded. The spectrum of 3C60-DE* exhibited maxima at 700, 440, 350, and 310 nm. The bleaching maximum observed at 330 nm coincides well with the ground-state maximum in this region. 3C60-DE* could be quenched by oxygen. Compared with 3C60*, the T-T annihilation rate constant of 3C60-DE* deduced ((5.03±1.31)×109 L·mol-1·s-1 for 3C60* and (3.53±0.87)×109 L·mol-1·s-1 for 3C60-DE*), and the life time of 3C60-DE*increased ((12.0±2.6) μs for 3C60*, (18.0±3.3) μs for 3C60-DE*). The reason may be that the connection of dexamethasone decreased the colliding probability of the C60 ball.