DNA-mediated exciton coupling and electron transfer between donor and acceptor stilbenes separated by a variable number of base pairs.
作者： Frederick D. Lewis , Yansheng Wu , Ligang Zhang , Xiaobing Zuo , Ryan T. Hayes
DOI: 10.1021/JA048664M
关键词:
摘要: The synthesis, steady-state spectroscopy, and transient absorption spectroscopy of DNA conjugates possessing both stilbene electron donor acceptor chromophores are described. These proposed to form nicked dumbbell structures in which a stilbenedicarboxamide stilbenediether separated by variable numbers A−T or G−C base pairs. nick is located either adjacent one the between two bases. Thermal dissociation profiles indicate that stable formed as few Circular dichroism (CD) spectra pair region characteristic B-DNA duplex structures, whereas CD at longer wavelengths display bands attributed exciton coupling stilbenes. sign intensity these dependent upon distance dihedral angle their transition dipoles [Δe ≈ Rda-2 sin(2θ)]. Pulsed laser excitation ...
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