Abstract
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 language | English |
|---|---|
| Pages (from-to) | 4951-4956 |
| Number of pages | 6 |
| Journal | Macromolecules |
| Volume | 48 |
| Issue number | 14 |
| DOIs | |
| Publication status | Published - 2015 Jul 28 |
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All Science Journal Classification (ASJC) codes
- Organic Chemistry
- Polymers and Plastics
- Inorganic Chemistry
- Materials Chemistry
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Multimodal Stimuli-Responsive Poly(2-isopropyl-2-oxazoline) with Dual Molecular Logic Gate Operations. / Kim, Joo Ho; Koo, Eunhye; Ju, Sang-Yong; Jang, Woo Dong.
In: Macromolecules, Vol. 48, No. 14, 28.07.2015, p. 4951-4956.Research output: Contribution to journal › Article
TY - JOUR
T1 - Multimodal Stimuli-Responsive Poly(2-isopropyl-2-oxazoline) with Dual Molecular Logic Gate Operations
AU - Kim, Joo Ho
AU - Koo, Eunhye
AU - Ju, Sang-Yong
AU - Jang, Woo Dong
PY - 2015/7/28
Y1 - 2015/7/28
N2 - 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.
AB - 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.
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U2 - 10.1021/acs.macromol.5b01046
DO - 10.1021/acs.macromol.5b01046
M3 - Article
VL - 48
SP - 4951
EP - 4956
JO - Macromolecules
JF - Macromolecules
SN - 0024-9297
IS - 14
ER -