Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 144, Issue 28, Pages 12627-12631Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jacs.2c05384
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Funding
- Air Force Office of Scientific Research [FA9550-22-1-0254]
- NSF CAREER award [DMR-2142887]
- Brandeis MRSEC [DMR-2011846]
- NSF MSN program [CHE-1807428]
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A new type of hydrazone photoswitch was developed, with a macrocyclic structure and phase transition feature, which can store a large amount of energy. It provides a promising strategy for molecular solar thermal energy storage applications.
The generally small Gibbs free energy difference between the Z and E isomers of hydrazone photoswitches has so far precluded their use in photon energy storing applications. Here, we report on a series of cyclic and acyclic hydrazones, which possess varied degrees of ring strain and, hence, stability of E isomers. The photoinduced isomerization and concurrent phase transition of the cyclic hydrazones from a crystalline to a liquid phase result in the storage of a large quantity of energy, comparable to that of azobenzene derivatives. We demonstrate that the macrocyclic photochrome design in combination with phase transition is a promising strategy for molecular solar thermal energy storage applications.
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