✦ LIBER ✦
pKa Switching Induced by the Change in the π-Conjugated System Based on Photochromism
✍ Scribed by Yuka Odo; Kenji Matsuda; Masahiro Irie
- Publisher
- John Wiley and Sons
- Year
- 2006
- Tongue
- English
- Weight
- 316 KB
- Volume
- 12
- Category
- Article
- ISSN
- 0947-6539
No coin nor oath required. For personal study only.
✦ Synopsis
Abstract
Two diarylethene derivatives 1 a and 2 a containing a 2,5‐diaryl‐3‐thienyl group have been designed and synthesized. The p__K__~a~ values of these compounds change upon photoirradiation. They have a phenol group as a proton source and a pyridinium group as an acceptor unit at each end of the π‐conjugated chain. The cyclization/cycloreversion reactions can be used to control the length of the π‐conjugated chain between the proton source and the acceptor. The change in the π‐conjugated chain length caused the p__K__~a~‐switching.