Photochromic polymers bearing various diarylethene chromophores as the pendant: synthesis, optical properties, and multicolor photochromism
作者:Hiroyasu Nishi、Tomoko Namari、Seiya Kobatake
DOI:10.1039/c1jm12707a
日期:——
Photochromic polymers with various diarylethene derivatives were synthesized by a conventional radical polymerization of styrene derivatives having diarylethene chromophores as the pendant. All the polymers exhibited reversible photochromism in the film as well as in solution, while the photocyclization conversion in the film decreased in comparison with that in solution because of a restriction of the conformational structure in the solid state. Although the photocyclization and photocycloreversion quantum yields at the initial stage of the reactions in the film were comparable to those in solution, the apparent cycloreversion quantum yield decreased along with the reaction, which is derived from a distribution of the quantum yields in the solid state. Finally, the photochromic terpolymers consisting of three diarylethene monomers which show photochromism changing color to cyan, magenta, and yellow were synthesized. The terpolymers were demonstrated to show bright colors including black, green, red, and blue both in solution and in the solid state by selective bleaching processes. Such multicolor photochromic polymers composed of diarylethene derivatives have a potential for rewritable photochromic display devices.
合成了具有多种二芳基乙烯衍生物的光敏聚合物,这是通过对具有二芳基乙烯色团作为侧链的苯乙烯衍生物进行常规自由基聚合获得的。所有聚合物在薄膜和溶液中均表现出可逆的光致变色特性。然而,由于固态中构象结构的限制,薄膜中的光环化转化率与溶液中相比有所降低。尽管在反应初期,薄膜中的光环化和光环反转量子产率与溶液中相当,但随着反应的进行,明显的环反转量子产率下降,这源于固态中量子产率的分布。最后,合成了由三种二芳基乙烯单体组成的光敏三元聚合物,其光致变色改变为青色、品红色和黄色。这些三元聚合物通过选择性漂白过程在溶液和固态中表现出明亮的颜色,包括黑色、绿色、红色和蓝色。由二芳基乙烯衍生物组成的这种多色光敏聚合物在可重写的光致变色显示设备中具有潜在应用。