An improved azobenzene core capped by two calixarene units isomerizes readily between trans and cis configurations via photochemical and/or thermal means. In addition, the presence of acid (particularly HCl) increases the rate of thermal cis→trans conversion. These enhancements to the functional response, control, and understanding of calixarene-capped azobenzene isomerization are important for future application in the dynamic encapsulation of small chemical species.
Bibliographical noteFunding Information:
This work was funded by the College of Wooster , the Copeland Fund for Independent Study , the Wilson Fund , and NSF Grants CHE-9977546 and CHE-0704026 . We thank the Mass Spectrometry Center of the University of Akron and the Department of Macromolecular Science and Engineering at Case Western Reserve University ( NSF Grant CHE-0821515 ) for instrumental support.
- Stimuli-responsive material
- Thermal isomerization