Negative photochromism of a TCF chromophore
Abstract
A novel negative photochromic compound has been designed and synthesized. The structure of the compound consists of a tricyanofuran (TCF) moiety and a quinoline moiety, bridged by a double bond. Upon irradiation with visible light, the neutral thermostable form of the compound quickly transforms to a cyclic zwitterionic form with over 90% conversion efficiency.