New supramolecular associations with photoaddressable azobenzene units have been synthesized in order to better understand the structure of these complexes and their mesophases. The complexes are formed by a melamine core and three V-shaped acids and they exhibit columnar mesomorphism. The acids consist of two different arms, one derived from azobenzene and the other derived from phenyl benzoate. This design has allowed decreasing Tg values and also avoiding the tendency to crystallize, favouring regular and reproducible structures, together with the possibility of photoresponse. The mesomorphic properties of the complexes have been studied by POM, DSC and X-ray diffraction, showing Colh or Colr mesophases. CD activity of these materials in the mesophase (that reveals chiral structures) has been controlled by irradiation with CPL. XRD and AFM studies have been carried out to check the molecular organization in the films before and after CPL exposure, which confirmed that the mesophase retains its structure after switching the corresponding supramolecular chirality.
为了更好地了解这些复合物及其介相的结构,我们合成了具有可光敏
偶氮苯单元的新型超分子结合体。这些复合物由一个
三聚氰胺核心和三个 V 形酸组成,呈现柱状中形。这些酸由两个不同的臂组成,一个来自
偶氮苯,另一个来自
苯甲酸苯酯。这种设计不仅降低了 Tg 值,还避免了结晶的趋势,有利于形成规则和可重复的结构,并有可能产生光响应。通过 POM、
DSC 和 X 射线衍射研究了这些复合物的介观性质,结果显示出 Colh 或 Colr 介相。这些材料在介相(显示手性结构)中的 CD 活性由
CPL 的辐照控制。通过 XRD 和原子力显微镜研究,检查了
CPL 照射前后薄膜中的分子结构,结果表明,在转换相应的超分子手性后,介相仍保持其结构。