KEYWORDS: Chromophores, Luminescence, Fluorescence resonance energy transfer, Energy transfer, Hydrogen, Molecules, Molecular assembly, Molecular self-assembly, Energy efficiency, Systems modeling
DNA is one of the best candidates as building blocks for bottom-up approach to nanometer size architecture in
nanotechnology. In natural photosynthetic system, the arrangement of porphyrin derivative with regulated distances,
orders and orientations provide an efficient photon-energy collecting and transmittion. Sequential arrangement of
chromophore (dye molecule) should therefore be a good model of artificial photosynthetic and photo-energy
transmission systems. Sequential arrangements of three kinds of chromophores separated by regulated distances equaling
approximately one pitch of the DNA duplex (3.4 nm) in non-covalent molecular assembly systems are constructed using
chromophore/oligo-DNA conjugates. Vectorial photo-energy transmission along the DNA helix axis by fluorescence
resonance energy transfer (FRET) in a sequential chromophore array was observed by fluorescence spectra
measurements and analyzed by time-resolved fluorescence spectroscopy measurements using a femtosecond pulse laser
system.
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