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Oligodeoxyfluorosides: Strong Sequence Dependence of Fluorescence Emission
James N Wilson1, Jianmin Gao, Eric T Kool
1Department of Chemistry, Stanford University, Stanford CA 94305-5080.
Tetrahedron
|October 18, 2007
Summary
Researchers created DNA-based oligomers (oligodeoxyfluorosides, ODFs) with pyrene and perylene fluorophores. Varying sequence and spacing enabled tunable, broad-spectrum visible light emission from a single excitation source.
Area of Science:
- Supramolecular Chemistry
- Organic Electronics
- Biophysics
Background:
- DNA can serve as a scaffold for assembling functional molecules.
- Oligomeric structures offer tunable electronic and photophysical properties.
- Fluorescent nucleobases are key components in molecular probes and sensors.
Purpose of the Study:
- To investigate the photophysical properties of DNA-templated oligomeric polyfluorophores.
- To explore how sequence and spacing influence fluorescence emission.
- To demonstrate the cooperative electronic interactions between fluorescent nucleobases.
Main Methods:
- Synthesis of eleven oligodeoxyfluorosides (ODFs) with varying lengths (4-7 monomers) and sequences.
- Utilized pyrene and perylene deoxyribosides as monomer fluorophores.
- Characterized fluorescence emission spectra, lifetimes, excitation, and absorption.
Main Results:
- Achieved emission maxima ranging from 380 nm to 557 nm, covering violet to orange-red visible light.
- Observed complex fluorescence due to monomer emissions, excimers (pyrene-pyrene, perylene-perylene), and exciplexes (pyrene-perylene).
- Demonstrated that sequence and spacing significantly alter spectral outcomes.
Conclusions:
- Two simple fluorophores on a DNA backbone can generate a wide range of colors with a single excitation.
- Fluorescent nucleobases in oligomers act cooperatively as electronic units.
- Oligomer sequence is critical for determining fluorescence properties, alongside composition.
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