Alignment and distance between organic chromophores mediate structure-property relationships, and are therefore being studied to enhance the performance of organic and polymeric semiconductor materials. To better understand the different kinds of excited species formed between these chromophores, we have developed PEG-ylated helical peptide scaffolds bearing up to three oxadiazole-containing phenylenevinylene oligomers as side chains. The chromophores are strategically positioned in the range of 6-17 � from each other, as dictated by the chemical and structural properties of the peptide. Circular dichroic (CD) spectroscopy showed the helical nature and the exciton coupled-CD suggested side chain interaction depending on the distance and dihedral angle between chromophores. The differences in the emission spectra and excited species formed as a function of chromophore presentation were indicated by photoluminescence and absorbance. Energy transfer between different excited species has been studied via time-resolved photoluminescence, indicating differences that are dictated by controlled organization of the chromphores.

Peptide-based templates for controlling the electronic properties of organic chromophores

244th National Meeting (2012)

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