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Visible light activated BINOL-derived chiroptical switches based on boron integrated hydrazone complexes
Sven van Vliet1, Georgios Alachouzos1, Folkert de Vries1
1Stratingh Institute for Chemistry, Zernike Institute for Advanced Materials, University of Groningen Nijenborgh 4 Groningen 9747 AG Netherlands B.L.Feringa@rug.nl.
Chemical Science
|September 12, 2022
Summary
Researchers developed new visible light-responsive chiroptical switches using boron coordination. These switches offer tunable thermal stability and reversibility for advanced photonic materials and nanotechnology applications.
Area of Science:
- Materials Science
- Photochemistry
- Supramolecular Chemistry
Background:
- Chiral optical switches control chirality with light, enabling applications in molecular switching, responsive systems, photochromic materials, and data storage.
- Tetrahedral boron coordination complexes offer unique chiroptical properties.
- Hydrazone ligands and BINOL (1,1'-bi-2-naphthol) are key components in developing advanced molecular systems.
Purpose of the Study:
- To design and synthesize novel visible light-responsive chiroptical switches.
- To investigate the effect of structural modifications on the chiroptical properties and thermal stability of these switches.
- To explore the potential of these switches in advanced applications like photonic materials and nanotechnology.
Main Methods:
- Synthesis of boron coordination complexes with a hydrazone ligand incorporating a dibenzo[a,d]-cycloheptene moiety.
- Utilizing optically pure BINOL as a chiral component.
- Employing circular dichroism (CD) spectroscopy to monitor chiroptical changes upon visible light irradiation.
- Investigating thermal stability by adjusting substituents on the cycloheptene ring's olefinic bond.
Main Results:
- The developed boron complexes exhibit significant chiroptical changes upon visible light irradiation, confirmed by CD spectroscopy.
- The thermal isomerization barrier and stability of the chiroptical switching systems can be precisely tuned by introducing substituents.
- The BINOL-derived complexes demonstrate excellent reversibility, robust photochemical properties, and overall stability.
Conclusions:
- Visible light-responsive chiroptical switches based on tetrahedral boron coordination were successfully developed.
- Tunable thermal stability and excellent reversibility make these BINOL-derived switches promising for advanced applications.
- These findings open new avenues for the design of sophisticated photonic materials and nanotechnology devices.
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