Sequential Energy and Electron Transfer in Polyisocyanopeptide-Based Multichromophoric Arrays

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• 作者：Ya-Shih Huang ; Xudong Yang ; Erik Schwartz ; Li Ping Lu ; Sebastian Albert-Seifried ; Chris E. Finlayson ; Matthieu Koepf ; Heather J. Kitto ; Burak Ulgut ; Matthijs B. J. Otten ; Jeroen J. L. M. Cornelissen ; Roeland J. M. Nolte ; Alan E. Rowan ; Richard H. Friend
• 刊名：Journal of Physical Chemistry B
• 出版年：2011
• 出版时间：February 24, 2011
• 年：2011
• 卷：115
• 期：7
• 页码：1590-1600
• 全文大小：1276K
• 年卷期：v.115,no.7(February 24, 2011)
• ISSN：1520-5207

文摘

We report on the synthesis and detailed photo-physical investigation of four model chromophore side chain polyisocyanopeptides: two homopolymers of platinum-porphyrin functionalized polyisocyanopeptides (Pt-porphyrin-PIC) and perylene-bis(dicarboximide) functionalized polyisocyanopeptides (PDI-PIC), and two statistical copolymers with different ratios of Pt-porphyrin and PDI molecules attached to a rigid, helical polyisocyanopeptide backbone. ¹H NMR and circular dichroism measurements confirm that our model compounds retain a chiral architecture in the presence of the chromophores. The combination of Pt-porphyrin and PDI chromophores allows charge- and/or energy transfer to happen. We observe the excitation and relaxation pathways for selective excitation of the Pt-porphyrin and PDI chromophores. Studies of photoluminescence and transient absorption on nanosecond and picosecond scales upon excitation of Pt-porphyrin chromophores in our multichromophoric assemblies show similar photophysical features to those of the Pt-porphyrin monomers. In contrast, excitation of perylene chromophores results in a series of energy and charge transfer processes with the Pt-porphyrin group and forms additional charge-transfer states, which behave as an intermediate state that facilitates electronic coupling in these multichromophoric systems.