Disperse and disordered: a mexylaminotriazine-substituted azobenzene derivative with superior glass and surface relief grating formation
作者:Robert Kirby、Ribal Georges Sabat、Jean-Michel Nunzi、Olivier Lebel
DOI:10.1039/c3tc32034k
日期:——
Materials containing azobenzene chromophores exhibit photomechanical behaviors, including the formation of surface relief gratings (SRG) caused by irradiation with two interfering laser beams. While azo-functionalized polymers were extensively studied, small molecules offer the advantage of being monodisperse species, which translates into easier synthesis and purification, as well as more uniform behavior. A drawback is that they tend to crystallize and do not always form high-quality thin films. Glass-forming compounds incorporating azobenzene were previously synthesized in several synthetic steps and in low yield. Herein, a Disperse Red 1 (DR1) functionalized with a mexylaminotriazine group is synthesized in 94% yield using a simple and straightforward procedure. It shows both the ability to form extremely stable glassy phases, and the ability to form SRG in the solid state with growth rates and grating heights closely similar to DR1-functionalized polymers.
含有偶氮苯发色团的材料表现出光机械行为,包括由两束干涉激光束照射引起的表面浮雕光栅(SRG)的形成。虽然偶氮官能化聚合物得到了广泛的研究,但小分子具有单分散物种的优势,这意味着更容易合成和纯化,以及更均匀的行为。缺点是它们容易结晶并且并不总是形成高质量的薄膜。此前,掺入偶氮苯的玻璃形成化合物是通过几个合成步骤合成的,但收率较低。在此,使用简单直接的程序合成了用甲氨基三嗪基团官能化的分散红 1 (DR1),收率达 94%。它显示出形成极其稳定的玻璃相的能力,以及形成固态 SRG 的能力,其生长速率和光栅高度与 DR1 功能化聚合物非常相似。