Electron Transfer Laser Flash Photolysis Between Nucleosides and Probe Triplet N-(2’-Hydroxyethyl)-1,8-naphthalimide

Abstract

Abstract: The time resolved transient absorption property, kinetics and mechanism of electron transfer(ET) process of the fluorescence probe, N-(2-hydroxyethyl)-1,8-naphthalimide(NPI) were studied. The transient absorption spectra of NPI in H₂O-CH₃CN solution were successfully detected upon pulsed excitation at 355 nm. ³NPI was proved as the primary excited state with lifetime of 147 μs. ³NPI underwent the T-T energy transfer with β-carotene and ET with triphenyl amine to produce NPI^-·. In the absence of quenchers, the self-quenching of ³NPI by the ground states of NPI took place via ET. The ET from nucleosides to ³NPI was also explored. NPI showed a strong electron-accepting capability and the absorbance of ³NPI was strongly quenched by the nucleosides. The formation of NPI^-· was facilitated to a great extent simultaneously. The bimolecular quenching rate constants of NPI by GUA and DGUA were determined as k₃=8.8×10⁶mol^-1·L·s^-1, k₄=2.1×10⁷ mol·L·s^-1. The ET between NPI and nucleosides was verified and the mechanism was proposed.

Key words: Naphthalimide, Nucleoside, 2’-Dioxyguanosine, Electron transfer, Laser flash photolysis

CLC Number:

O646

TrendMD:

LI Hui-Qing, JIANG Zhi-Qin, Wang Xin, PAN Yang, WANG Feng, YU Shu-Qin . Electron Transfer Laser Flash Photolysis Between Nucleosides and Probe Triplet N-(2’-Hydroxyethyl)-1,8-naphthalimide[J]. Chem. J. Chinese Universities, 2004, 25(11): 2134.

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Electron Transfer Laser Flash Photolysis Between Nucleosides and Probe Triplet N-(2’-Hydroxyethyl)-1,8-naphthalimide

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