Photoreversible Supramolecular Polymerisation and Hierarchical Organization of Hydrogen-Bonded Supramolecular Co-polymers Composed of Diarylethenes and Oligothiophenes
作者:Shiki Yagai、Keisuke Ohta、Marina Gushiken、Kazunori Iwai、Atsushi Asano、Shu Seki、Yoshihiro Kikkawa、Masakazu Morimoto、Akihide Kitamura、Takashi Karatsu
DOI:10.1002/chem.201103465
日期:2012.2.20
equipped with two monotopic melamine hydrogen‐bonding sites and oligothiophene‐functionalized ditopic cyanurate (OTCA) were mixed in a nonpolar solvent to form AA‐BB‐type supramolecular co‐polymers (SCPs) bearing photoswitchable moieties in their main chains and extended π systems as side chains. UV/Vis, fluorescence, dynamic light scattering (DLS), TEM, and AFM studies revealed that the two functional
二芳基乙烯1在非极性溶剂中混合了具有两个单点三聚氰胺氢键合位点和低聚噻吩官能化的二聚氰尿酸酯(OTCA)的AA-BB型超分子共聚物(SCP),它们的主链和π系统扩展为光可开关部分侧链。UV / Vis,荧光,动态光散射(DLS),TEM和AFM研究表明,这两种功能共聚单体在溶液中形成了柔性准一维SCP,该溶液通过H的H聚集分层自组织成螺旋纳米纤维。寡噻吩侧链。光谱研究表明,在用紫外线照射SCP后,发生了从H聚集态到非聚集单体寡聚噻吩侧链的转变,这表明仅通过氢键相互作用将小的寡聚体结合在一起形成。TEM和AFM可视化了与去除溶剂后形成的细长单条SCP链相对应的未折叠原纤维。螺旋纳米纤维在用可见光照射UV照射的溶液后再生。这些结果表明,通过使用双芳烃和π-共轭低聚物进行适当的超分子设计,可以有效地控制超分子聚合及其后的层次结构。