Hsin-Hung Lin, Cheng-Chung Chang
Nov 1, 2009
Citations
0
Influential Citations
17
Citations
Journal
Dyes and Pigments
Abstract
Abstract Different 10 H -phenothiazine derivatives modified at their 3- and 3,7-positions with conjugated electron-deficient pyridine or pyridinium groups using ethenyl linkers are described. Spectral variations of 3-(( E )-2-(Methylpyridium-4-yl)vinyl)-10 H -phenothiazine iodide and 3,7-bis(( E )-2-(Methylpyridium-4-yl)vinyl)-10 H -phenothiazine diiodide, which are attributed to intramolecular charge transfer, electronic rearrangement and contact ion-pair mechanisms, were observed to be either base or ion dependent. Depending on the extent of deprotonation of the nitrogen atom in the 10-position of the phenothiazine core, donor–acceptor or push–pull systems provide fluorophore-switching and potential near infrared sensor application.