Construction of energy transfer pathways self-assembled from DNA-templated stacks of anthracene

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• 作者：Rika Iwaura ; Hiroharu Yui ; Yuu Someya ; Mayumi Ohnishi-Kameyama
• 关键词：Acene ; DNA ; Energy transfer ; Excimer ; Nanostructures ; Self-assembly
• 刊名：Journal of Photochemistry and Photobiology B: Biology
• 出版年：5 January, 2014
• 年：2014
• 卷：130
• 期：Complete
• 页码：199-204
• 全文大小：1149 K

文摘

We describe optical properties of anthracene stacks formed from single-component self-assembly of thymidylic acid-appended anthracene 2,6-bis[5-(3鈥?thymidylic acid)pentyloxy] anthracene (TACT) and the binary self-assembly of TACT and complementary 20-meric oligoadenylic acid (TACT/dA₂₀) in an aqueous buffer. UV-Vis and emission spectra for the single-component self-assembly of TACT and the binary self-assembly of TACT/dA₂₀ were very consistent with stacked acene moieties in both self-assemblies. Interestingly, time-resolved fluorescence spectra from anthracene stacks exhibited very different features of the single-component and binary self-assemblies. In the single-component self-assembly of TACT, a dynamic Stokes shift (DSS) and relatively short fluorescence lifetime (蟿 = 0.35 ns) observed at around 450 nm suggested that the anthracene moieties were flexible. Moreover, a broad emission at 530 nm suggested the formation of an excited dimer (excimer). In the binary self-assembly of TACT/dA₂₀, we detected a broad, red-shifted emission component at 534 nm with a lifetime (蟿 = 0.4 ns) shorter than that observed in the TACT single-component self-assembly. Combining these results with the emission spectrum of the binary self-assembly of TACT/5鈥?HEX dA₂₀, we concluded that the energy transfer pathway was constructed by columnar anthracene stacks formed from the DNA-templated self-assembly of TACT.