Multimodal Stimuli-Responsive Poly(2-isopropyl-2-oxazoline) with Dual Molecular Logic Gate Operations

Joo Ho Kim, Eunhye Koo, Sang Yong Ju, Woo Dong Jang

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)


Azobenzene end-functionalized telechelic POx (Az-POx-Az) was designed for as multimodal stimuli-responsive polymer. Az-POx-Az (0.25 g/L) in physiological saline (150 mM NaCl) phosphate buffered solution (10 mM PBS, pH 7.4) exhibited fully reversible trans-cis photoisomerism upon alternate irradiation with 365 and 254 nm UV light. The photoisomerization of the azobenzene moieties influenced the lower critical solution temperature (LCST), and the cis form exhibited a slightly higher LCST than the trans form. Circular dichroism measurements of Az-POx-Az with cyclodextrins (CDs) exhibited induced circular dichroism at the absorption band of the azobenzene moiety, indicating the formation of host-guest complexes between the azobenzene moieties in Az-POx-Az and the CDs. After formation of host-guest complexes consisting of the azobenzene moieties and the CDs, Az-POx-Az exhibited increased LCSTs. Interestingly, the LCSTs of Az-POx-Az with α-CD and β-CD moved in opposite directions upon photoisomerization. By the changing from the trans to cis form, Az-POx-Az with α-CD exhibited a decreased LCST; however, Az-POx-Az with β-CD exhibited an increased LCST. Using the interconversions between the transparent and turbid states of the Az-POx-Az solution, we could realize two different logic circuit modes using three different external stimuli, i.e., temperature, UV light, and cyclodextrins.

Original languageEnglish
Pages (from-to)4951-4956
Number of pages6
Issue number14
Publication statusPublished - 2015 Jul 28

Bibliographical note

Publisher Copyright:
© 2015 American Chemical Society.

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry


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