%0 Journal Article
%T Tetraphenylethene-Induced Free Volumes for the Isomerization of Spiropyran toward Multifunctional Materials in the Solid State
%J -
%D 2018
%R https://doi.org/10.1021/acsami.8b10322
%X Solid-state photochromic materials with reversible and adjustable optical properties are very appealing because of their wide prospects in advanced functional materials. Yet, it remains a significant challenge to develop such materials in the solid state. In this study, a tetraphenylethene derivative (SP每TPE每SP)-based solid-state photoswitch, which exhibits reversible photochromism in the solid state, was constructed. Efficient photoswitching between SP每TPE每SP and its photoisomer MC每TPE每MC is assisted by the large free volumes caused by the nonplanar molecular structures of the TPE1 moieties and the intramolecular 羽每羽 stackings between the two MC moieties. The free volumes are large enough to allow for the transport of HCl gas molecules for an acidochromic response. Furthermore, the morphology of the SP每TPE每SP solid surface can be regulated by ultraviolet light irradiation. The contact angles of the SP每TPE每SP solid surface can be decreased, changing from 97 to 82∼. Therefore, SP每TPE每SP with a rather simple molecular structure is appealing for advanced multifunctional materials
%U https://pubs.acs.org/doi/10.1021/acsami.8b10322