Hydrogen-bond-mediated photoinduced electron-transfer: Novel dimethylaniline-anthracene ensembles formed via Watson-Crick base-pairing
Hydrogen-bond-mediated photoinduced electron-transfer: Novel dimethylaniline-anthracene ensembles formed via Watson-Crick base-pairing
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DOI：
10.1021/ja005547s
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发表时间：
2001-04-25
影响因子：
15
通讯作者：
Wiederrecht, G
中科院分区：
文献类型：
--
作者：
Sessler, JL;Sathiosatham, M;Wiederrecht, G
据报道，通过鸟苷-胞苷沃森-克里克碱基配对相互作用合成了一种新的非共价蒽-二甲基苯胺二联体（整体 I）。根据时间分辨荧光猝灭和瞬态吸收测量的组合推断，在 420 nm 激发时，发生从二甲基苯胺供体到蒽受体单线态激发态的光诱导电子转移。在室温下的甲苯中，光诱导系综内电子转移和随后的反向电子转移（电荷复合）的速率常数分别为 k(CS) = (3.5 +/- 0.03) x 10(10) s(-1) 和 k(CR) = (1.42 +/- 0.03) x 10(9) s(-1)。
The synthesis of a new, noncovalent anthracene-dimethylaniline dyad (ensemble I) held together via guanosine-cytidine Watson-Crick base-pairing interactions is reported. Upon excitation at 420 nm, photoinduced electron-transfer from the dimethylaniline donor to the singlet excited state of the anthracene acceptor occurs, as inferred from a combination of time-resolved fluorescence quenching and transient absorption measurements. In toluene at room temperature, the rate constants for photoinduced intraensemble electron-transfer and subsequent back-electron-transfer (charge recombination) are k(CS) = (3.5 +/- 0.03) x 10(10) s(-1) and k(CR) = (1.42 +/- 0.03) x 10(9) s(-1), respectively.