Photo-electronic properties and electron transfer of organic-dye nano particles

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Supramolecular complex between water soluble porphyirns (donor) and naphthalene diimides (NDI, acceptor) was studied for the elucidation of basic mechanisms involved in photo-functional organic molecular assemblies. Efficient complex formation with an association constant over 10 to the 5th power is observed for complexes between a cationic porphyrin and anionic NDIs in an aqueous solution. It has been concluded from structural and environmental effect on the complex formation that the main driving force is the hydrophobic interaction, which is strongly affected by the coulomb interaction. Spectroscopic studies indicate the fast forward and back electron transfer in the assembly, of which the time constants are shorter than a few picoseconds.