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Hokkaido University Collection of Scholarly and Academic Papers >
Institute for Chemical Reaction Design and Discovery : ICReDD >
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Red-light photoswitching of indigos in polymer thin films
| Title: | Red-light photoswitching of indigos in polymer thin films |
| Authors: | Kuntze, Kim Browse this author | | Viljakka, Jani Browse this author | | Virkki, Matti Browse this author | | Huang, Chung-Yang (Dennis) Browse this author | | Hecht, Stefan Browse this author | | Priimagi, Arri Browse this author |
| Issue Date: | 22-Feb-2023 |
| Publisher: | Royal Society of Chemistry |
| Journal Title: | Chemical science |
| Volume: | 14 |
| Issue: | 10 |
| Start Page: | 2482 |
| End Page: | 2488 |
| Publisher DOI: | 10.1039/d2sc06790k |
| Abstract: | Through simple synthetic derivatisation, the parent indigo dye becomes a red-light E-Z photoswitch exhibiting negative photochromism and tuneable thermal isomerisation kinetics. These attributes make indigo derivatives extremely attractive for applications related to materials and living systems. However, there is a lack of knowledge in translating indigo photoswitching dynamics from solution to solid state - the environment crucial for most applications. Herein, we study the photoswitching performance of six structurally distinct indigo derivatives in five polymers of varying rigidity. Three key strategies are identified to enable efficient photoswitching under red (660 nm) light: (i) choosing a soft polymer matrix to minimise its resistance toward the isomerisation, (ii) creating free volume around the indigo molecules through synthetic modifications, and (iii) applying low dye loading (<1% w/w) to inhibit aggregation. These strategies are shown to improve both photostationary state distributions and the thermal stability of the Z isomer. When all three strategies are implemented, the isomerisation performance (>80% Z form in the photostationary state) is nearly identical to that in solution. These findings thus pave the way for designing new red-light photochromic materials based on indigos. |
| Type: | article |
| URI: | http://hdl.handle.net/2115/88950 |
| Appears in Collections: | 化学反応創成研究拠点：ICReDD (Institute for Chemical Reaction Design and Discovery : ICReDD) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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