期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 26, 期 2, 页码 396-400出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201904481
关键词
photoactuators; photochemistry; photoinduced bending; solid-state [2+2] photopolymerization
资金
- SERB, New Delhi, India [SR/S1/IC-08/2013]
- DST-INSPIRE
- IIT KGP
The single crystals of two structural isomers of bis-olefinic molecules were shown to have contrasting properties in terms of their photoreactivity: one exhibits an excellent ability to form polymers, accompanied with bending of crystals upon irradiation, while the other is photostable. The photoreactive crystal is a first example in which [2+2] polymerization leads to bending of the crystals, with implications for the design of photoactuators. The hydrate formation ability of one of these molecular isomers promotes the solid-state reactivity in its crystal, as the H2O molecules act as a template to bring the olefin molecules into the required arrangement for [2+2] polymerization. Further, the crystals of the polymer exhibited better flexibility and smoothed surfaces compared to those of the monomers. In addition, under UV-light the diene emits bluish violet light while the polymer emits green light, indicating that the luminescence property can be tuned through photoirradiation.
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