strands by solid-phase synthesis leads to fluorescence enhancement compared to the free chromophore. In addition, linear absorption studies show the formation of an excitonically coupled H-type dimer in the hybridized duplex. Ultrafast third- and fifth-order transient absorption spectroscopy of this non-fluorescent dimer suggests immediate (sub-200 fs) exciton transfer and annihilation due to the proximity
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巴比妥酸部
花青 rBAM2 作为核碱基替代物的 RNA 的合成和光谱分析。与游离发色团相比,通过固相合成掺入 RNA 链会导致荧光增强。此外,线性吸收研究表明在杂交的双链体中形成了激子耦合的 H 型二聚体。这种非荧光二聚体的超快三阶和五阶瞬态吸收光谱表明,由于 rBAM2 单元的接近,激子立即(低于 200 fs)转移和湮灭。