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Novel fluorophores for single-molecule imaging.
Katherine A Willets1, Oksana Ostroverkhova, Meng He
1Department of Chemistry, Stanford University, Stanford, California 94305, USA.
Journal of the American Chemical Society
|January 30, 2003
Summary
New nonlinear optical chromophores offer stable, sensitive single-molecule detection. These advanced fluorophores are tunable across a wide emission range and respond to local environment changes.
Area of Science:
- Organic Chemistry
- Materials Science
- Spectroscopy
Background:
- Nonlinear optical (NLO) chromophores are crucial for advanced optical applications.
- Single-molecule detection (SMD) requires fluorophores with high fluorescence quantum yields and stability.
- Dicyanodihydrofuran acceptors paired with amine donors represent a promising class of NLO chromophores.
Purpose of the Study:
- To present a new class of NLO chromophores for single-molecule detection.
- To demonstrate the tunable emission range and unique properties of these fluorophores.
- To explore their potential for novel single-molecule reporter experiments.
Main Methods:
- Synthesis and characterization of six novel dicyanodihydrofuran-based fluorophores.
- Evaluation of fluorescence quantum yields and photostability in polymeric hosts.
- Measurement of photophysical properties including emission spectra, ground-state dipole moments, and polarizability anisotropies.
Main Results:
- Six fluorophores were synthesized, emitting from 505 to 646 nm.
- These chromophores exhibit high fluorescence quantum yields and stability, suitable for SMD.
- The molecules show sensitivity to local rigidity and possess large ground-state dipole moments and polarizability anisotropies.
Conclusions:
- Dicyanodihydrofuran-based NLO chromophores are effective for single-molecule detection.
- Their tunable emission and sensitivity to local environment enable new reporter applications.
- These findings expand the toolkit for advanced single-molecule spectroscopy and materials design.