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Citation: LIU Rui-Li, ZHAO Hong-Wei, ZHANG Zhao-Xia, YAO Si-De, LI Qing-Nuan, LI Wen-Xin. Laser Flash Photolysis of C₆₀-dexamethasone[J]. Acta Physico-Chimica Sinica, ;2007, 23(07): 1127-1130. doi: 10.3866/PKU.WHXB20070732 shu

Laser Flash Photolysis of C₆₀-dexamethasone

1.
Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, P. R. China

Received Date: 23 January 2007
Available Online: 8 May 2007

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.
- C60-dexamethasone; Laser flash photolysis; Excited triplet state; Annihilation rate constant; Triplet lifetime
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Laser Flash Photolysis of C₆₀-dexamethasone