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Environment-sensitive fluorophore emitting in protic environments.

Seiichi Uchiyama¹, Kazuyuki Takehira, Toshitada Yoshihara

¹Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan. seiichi@mol.f.u-tokyo.ac.jp

Organic Letters

|December 1, 2006

Summary

This study details the fluorescence of 8-methoxy-4-methyl-2H-benzo[g]chromen-2-one, a compound that is nonfluorescent in aprotic solvents but strongly fluorescent in protic ones. This property makes it useful for developing new fluorescent sensors.

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Time-Resolved Fluorescence Anisotropy from Single Molecules for Characterizing Local Flexibility in Biomolecules

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Area of Science:

Organic Chemistry
Photophysics
Materials Science

Background:

The fluorescence properties of organic molecules are crucial for various applications, including sensing and imaging.
Understanding the influence of solvent polarity on fluorescence is essential for designing efficient fluorophores.

Purpose of the Study:

To investigate the unusual fluorescence behavior of 8-methoxy-4-methyl-2H-benzo[g]chromen-2-one (1).
To evaluate the potential of compound 1 as a fluorogenic sensor.

Main Methods:

Spectroscopic analysis of compound 1 in different solvent polarities (aprotic vs. protic).
Determination of fluorescence quantum yields (Phi(f)) in various solvents.
Assessment of sensor applicability using a "off-on" fluorescence response.

Main Results:

Compound 1 exhibits negligible fluorescence in aprotic solvents (Phi(f) < 0.0003 in n-hexane).
Strong fluorescence emission at long wavelengths (>450 nm) is observed in protic solvents (Phi(f) = 0.21 in methanol).
Compound 1 demonstrates potential for developing "off-on" fluorescent sensors.

Conclusions:

The fluorescence of 8-methoxy-4-methyl-2H-benzo[g]chromen-2-one is highly sensitive to solvent proticity.
This solvatochromic fluorescence behavior enables its use in designing novel fluorescent sensors.