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Internalization and Observation of Fluorescent Biomolecules in Living Microorganisms via Electroporation

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Tuneable white fluorescence from intramolecular exciplexes.

Jerzy Karpiuk¹, Ewelina Karolak, Jacek Nowacki

¹Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland. karpiuk@ichf.edu.pl

Physical Chemistry Chemical Physics : PCCP

|June 10, 2010

Summary

Crystal violet lactone (CVL) exhibits broad dual fluorescence, producing white light by combining blue and orange emissions. This property, tunable by solvent polarity, offers a new pathway for designing custom white light-emitting molecules.

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Area of Science:

Photophysics
Materials Science
Organic Chemistry

Background:

Crystal violet lactone (CVL) exhibits unique dual fluorescence.
This fluorescence resembles white light emission.
The emission arises from distinct charge transfer (CT) bands.

Purpose of the Study:

To investigate the mechanism of dual fluorescence in CVL.
To explore the potential of CVL for generating tunable white light.
To establish a structure-property relationship for designing novel white fluorophores.

Main Methods:

Spectroscopic analysis of CVL in various solvent polarities.
Investigation of charge transfer (CT) band characteristics.
Correlation of molecular structure with photophysical properties.

Main Results:

CVL displays broad dual fluorescence (FWHM > 9100 cm(-1)) with blue and orange CT bands.
Solvent polarity tunes the emission color across the CIE chromaticity diagram, including white.
Dual emission is a general property of CVL-like D-A structures on sp(3) carbon atoms.

Conclusions:

The photophysics-structure relationship enables prediction and design of white fluorophores.
A novel concept for white light generation using small molecules is proposed.
CVL-based D-A systems serve as a template for developing customized white fluorophores.