Photo‐ and Thermoresponsive Dehydration of Spiropyran‐Functionalized Polymer Regulated by Molecular Recognition,Macromolecular Rapid Communications

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Photo‐ and Thermoresponsive Dehydration of Spiropyran‐Functionalized Polymer Regulated by Molecular Recognition
Macromolecular Rapid Communications ( IF 4.2 ) Pub Date : 2017-07-26 , DOI: 10.1002/marc.201700234
Kimio Sumaru ₁ , Toshiyuki Takagi ₁ , Taku Satoh ₁ , Toshiyuki Kanamori ₁

Affiliation

The photo‐ and thermoresponse of poly(N‐isopropylacrylamide) (pNIPAAm) functionalized with spiropyran chromophore is examined with respect to the influence of molecular recognition by cyclodextrin (CD). Characterization in aqueous solutions of spiropyran‐functionalized poly(N,N‐dimethylacrylamide) under coexistence of α‐, β‐, or γ‐CD reveals that β‐CD selectively includes the ring‐closing isomer of the chromophore, which is dominant under light irradiation, while no inclusion is observed for the protonated ring‐opening isomer, which is dominant in the dark before irradiation. As a result, it is shown that the selective inclusion of the chromophore at a polymer side chain is switched by light irradiation. Further, drastic photoresponsive dehydration of spiropyran‐functionalized pNIPAAm is inhibited only by β‐CD out of three examined CDs, demonstrating that the molecular recognition regulates the dehydration of the whole polymer triggered by the photoswitching of the chromophore introduced at only 1 mol% functionalization.

中文翻译：

分子识别调控的螺吡喃官能化聚合物的光热响应脱水

就环糊精（CD）对分子识别的影响，研究了用螺吡喃发色团官能化的聚（N-异丙基丙烯酰胺）（pNIPAAm）的光响应和热响应。螺吡喃官能化聚（N，N-二甲基丙烯酰胺）在α-，β-或γ-CD的共存下显示，β-CD选择性地包含发色团的闭环异构体，该异构体在光照射下占主导地位，而质子化的开环未观察到包含物异构体，在辐照前的黑暗中占主导地位。结果表明，通过光辐照切换了生色团在聚合物侧链上的选择性包含。此外，螺环吡喃官能化的pNIPAAm的剧烈光响应脱水仅被3个检测的CD中的β-CD抑制，表明分子识别调节了仅以1 mol％官能度引入的生色团的光转换触发的整个聚合物的脱水。

更新日期：2017-07-26

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