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Fluorescent Rotary Switches: Four- vs Three-Substituted Phthalimide Boron Difluoride Schiff Base Complexes
Dancho Yordanov1,2, Rastislav Smolka3, Kosuke Nakashima4
1Department of Organic Chemistry, University of Chemical Technology and Metallurgy, 8 St. Kliment Ohridski blvd, 1756 Sofia, Bulgaria.
This study explores how changing parts of phthalimide boron difluoride Schiff base complexes affects their fluorescence. These fluorescent molecular rotors show unique light-emitting properties influenced by their structure and environment.
Area of Science:
- Materials Science
- Photochemistry
- Supramolecular Chemistry
Background:
- Phthalimide boron difluoride Schiff base complexes are investigated for their fluorescent properties.
- Their ground-state zwitterionic structures lead to negative solvatochromism and blue-green emission in solution.
- Photoluminescence quantum yields are moderate to satisfactory.
Purpose of the Study:
- To investigate the influence of substitution patterns on the photophysical properties of these complexes.
- To understand the fluorescence mechanism and structure-property-function relationships.
- To explore solid-state mechanochromic switching behavior.
Main Methods:
- Theoretical calculations (ground-state and excited-state).
- Time-resolved emission spectroscopy.
- Fluorescence lifetime measurements and species-associated emission spectra.
- X-ray structure data analysis for solid-state studies.
Main Results:
- Excited-state rotation triggered by planar-induced charge transfer shifts emission to the green region.
- Two emitting excited species in equilibrium were observed via a planar transition-state barrier.
- Substitution patterns influenced solid-state mechanochromic switching behavior.
Conclusions:
- The substitution pattern significantly impacts the fluorescence mechanism and photoluminescence properties.
- Understanding these relationships is key for designing novel fluorescent materials.
- These complexes exhibit potential as fluorescent molecular rotors with tunable properties.
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