5 years ago

Photo- and Thermoresponsive Dehydration of Spiropyran-Functionalized Polymer Regulated by Molecular Recognition

Photo- and Thermoresponsive Dehydration of Spiropyran-Functionalized Polymer Regulated by Molecular Recognition
Taku Satoh, Kimio Sumaru, Toshiyuki Kanamori, Toshiyuki Takagi
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. Drastic photoresponsive dehydration of a spiropyran-functionalized polymer induced by the photoisomerization of the chromophores at side chains from a cationic form to a nonionic and hydrophobic form is regulated by the inclusion of hydrophobic isomer by cyclodextrin in a size-specific manner.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/marc.201700234

You might also like
Discover & Discuss Important Research

Keeping up-to-date with research can feel impossible, with papers being published faster than you'll ever be able to read them. That's where Researcher comes in: we're simplifying discovery and making important discussions happen. With over 19,000 sources, including peer-reviewed journals, preprints, blogs, universities, podcasts and Live events across 10 research areas, you'll never miss what's important to you. It's like social media, but better. Oh, and we should mention - it's free.

  • Download from Google Play
  • Download from App Store
  • Download from AppInChina

Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.