Azobenzene derivatives carrying a nitroxide radical
Shin'ichi Nakatsuji1, Masahiro Fujino, Satoko Hasegawa
1Department of Material Science, Graduate School of Material Science, University of Hyogo, 3-2-1 Kouto, Kamigori, Hyogo 678-1297, Japan. nakatuji@sci.u-hyogo.ac.jp
New azobenzene derivatives with nitroxide radicals were synthesized and studied for photoisomerization. Unsubstituted derivatives showed promising photochromic behavior, altering magnetic interactions upon light exposure.
Area of Science:
- Organic Chemistry
- Photochemistry
- Materials Science
Background:
- Azobenzene derivatives are known for their photochromic properties.
- Nitroxide radicals possess unique magnetic properties.
- Combining these functionalities could lead to novel photoresponsive materials.
Purpose of the Study:
- To synthesize trans-azobenzene derivatives incorporating nitroxide radicals.
- To investigate the photoisomerization behavior of these novel compounds.
- To explore the impact of structural modifications on photochromism and magnetic interactions.
Main Methods:
- Synthesis of several trans-azobenzene derivatives with nitroxide radicals.
- Photoirradiation experiments to induce isomerization.
- Isolation and characterization of cis-isomers.
- Observation of changes in intermolecular magnetic interactions.
Main Results:
- Successful synthesis of azobenzene derivatives with nitroxide radicals.
- Photoisomerization was observed for derivatives unsubstituted at the para-position.
- The corresponding cis-isomers were isolated as stable solid materials.
- Changes in intermolecular magnetic interactions correlated with structural changes during photochromism.
Conclusions:
- Azobenzene derivatives with nitroxide radicals exhibit photochromic properties.
- Para-unsubstituted derivatives are key for observing photoisomerization.
- These compounds demonstrate potential for light-controlled magnetic interactions.
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