Energy Transfer in Extended Thienylene-Phenylene-Ethynylene Dendrimers

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• 作者：Sevnur K枚m眉rl眉 ; Seoung Ho Lee ; Tracy McCarley ; Kirk S. Schanze ; Valeria D. Kleiman
• 刊名：Journal of Physical Chemistry B
• 出版年：2011
• 出版时间：December 29, 2011
• 年：2011
• 卷：115
• 期：51
• 页码：15214-15220
• 全文大小：901K
• 年卷期：v.115,no.51(December 29, 2011)
• ISSN：1520-5207

文摘

We present a new family of dendrimers with all-conjugated, thienylene (Th) containing photoactive backbones and branched end-groups. Steady-state spectroscopy demonstrates a donor鈥揳cceptor system, while picosecond time-resolved fluorescence characterizes a vectorial energy transfer from phenylene-ethynylene (PE) units at the periphery to thienylene-containing PE units at the core. Energy transfer rates of 1.5 and 3.5 ps are observed for generation 2 and 3 dendrimers, indicative of a weakly coupled donor鈥揳cceptor system, with couplings on the order of 40鈥?0 cm^鈥?.