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Unusual fluorescence red shifts in (TICT)-forming boranes
1I. N. Stranski Institute, Technical University, Berlin, Strasse des 17 Juni 112, D-10623, Berlin, Germany.
Journal of Fluorescence
|November 16, 2013
Summary
Pyrrole substituted mesitylboranes and benzonitriles exhibit solvent-sensitive forbidden emission. Twisting these molecules enhances both fluorescence red shift and the degree of forbiddenness.
Area of Science:
- Photochemistry
- Organic Chemistry
- Materials Science
Background:
- Mesitylboranes and benzonitriles are organic compounds with interesting photophysical properties.
- Forbidden emission in organic molecules is a phenomenon that impacts their luminescence efficiency and spectral characteristics.
Purpose of the Study:
- To investigate the photophysical behavior of pyrrole substituted mesitylboranes and benzonitriles.
- To understand the influence of solvent polarity and molecular conformation on forbidden emission.
Main Methods:
- Synthesis of pyrrole substituted mesitylboranes and benzonitriles.
- Spectroscopic analysis (UV-Vis absorption, fluorescence emission) in various solvents.
- Computational modeling to study molecular geometry and electronic transitions.
Main Results:
- Pyrrole substituted mesitylboranes and benzonitriles display highly solvent-sensitive forbidden emission.
- Increased molecular twisting in model compounds leads to a red shift in fluorescence and enhanced forbiddenness.
- Solvent polarity significantly affects the emission properties, indicating strong solute-solvent interactions.
Conclusions:
- The photophysical properties of these compounds are strongly dependent on both molecular structure and the surrounding environment.
- Molecular twisting is a key factor in modulating forbidden emission and fluorescence characteristics.
- These findings provide insights into the design of novel luminescent materials with tunable properties.
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