1579999-10-2Relevant academic research and scientific papers
Photoswitchable ring-opening polymerization of lactide catalyzed by azobenzene-based thiourea
Dai, Zhongran,Cui, Yaqin,Chen, Changjuan,Wu, Jincai
supporting information, p. 8826 - 8829 (2016/07/22)
The reactivity of a catalytic polymerization system using photoresponsive azobenzene-based thiourea/PMDETA as a catalyst could be switched between slow and fast states by alternating exposure to UV and ambient light, because the active site of azobenzene thiourea is blocked via intramolecular hydrogen bonding when the azobenzene thiourea transfers from the E isomer to the Z isomer under UV irradiation.
Photoswitchable thioureas for the external manipulation of catalytic activity
Osorio-Planes, Laura,Rodriguez-Escrich, Carles,Pericas, Miquel A.
, p. 1704 - 1707 (2014/04/17)
A series of azobenzene-based thiourea catalysts have been developed with the aim of achieving control over the catalytic activity by the use of light. The conceptual design of these systems relies on the inactivation by means of intramolecular hydrogen bonding, only likely to take place in one of their isomeric forms. After fine structure modulation of the catalyst a substantial difference in activity has been observed between the irradiated and the nonirradiated reaction. Furthermore, the system allowed in situ manipulation of the catalyst activity during the course of a given experiment.
