Hydrogen-bond-mediated photoinduced electron-transfer: novel dimethylaniline-anthracene ensembles formed via Watson-Crick base-pairing. |
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| Authors: | J L Sessler M Sathiosatham C T Brown T A Rhodes G Wiederrecht |
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| Institution: | Contribution from the Department of Chemistry and Biochemistry, University of Texas at Austin, Austin, Texas 78712, USA. |
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| Abstract: | 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. |
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