Coumarin-based emissive hexacatenars: synthesis, 2D and 3D self-assembly and photodimerization
作者:Yulong Xiao、Xiaoping Tan、Wei Xing、Kai Zhao、Bei Zhang、Xiaohong Cheng
DOI:10.1039/c8tc04040k
日期:——
polycatenars can exhibit highly fluorescent emission with large Stokes shifts (90–118 nm) in solution and as films. Most interestingly, the photodimerization in both LC and non-LC phases led to the formation of absolutely hexagonal columnar LC phases, while photodimerization in gel states led to the formation of flowerlike or 3D porous morphologies. Either columnar phases or gels with flowerlike or ordered
通过点击反应合成了由香豆素中央核在两侧具有1,2,3-三唑树枝状翼组成的不对称香豆素聚catenar液晶的第一个例子。使用POM,DSC,XRD,SEM,IR,UV-vis光谱和光致发光测量研究了它们的性质。这种多类别可以自组装成不同的柱状液晶相,范围从p 4 mm到p 2 mm到p 6 mm以其本体状态进入有机凝胶,并在不同溶剂中形成纳米带或多孔形态。这些聚类在溶液和薄膜中可以表现出高的荧光发射,并具有较大的斯托克斯位移(90–118 nm)。最有趣的是,在LC和非LC相中的光二聚化导致形成绝对的六角柱状LC相,而在凝胶态中的光二聚化导致形成花状或3D多孔形态。首先在香豆素基衍生物中观察到柱状相或具有花状或有序多孔形态的凝胶。