Journal
JOURNAL OF PHYSICAL CHEMISTRY B
Volume 115, Issue 7, Pages 1590-1600Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp1071605
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Funding
- ESF-SONS-BIONICS
- SUPER-MATES
- EPSRC
- Technology Foundation STW
- council for the Chemical Sciences of The Netherlands Organization for Scientific Research
- Royal Academy for Arts and Sciences
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We report on the synthesis and detailed photophysical 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. H-1 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-potphyrin 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.
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