Engineering of Supramolecular H-Bonded Nanopolygons via Self-Assembly of Programmed Molecular Modules
作者:Anna Llanes-Pallas、Carlos-Andres Palma、Luc Piot、Abdelhalim Belbakra、Andrea Listorti、Maurizio Prato、Paolo Samorì、Nicola Armaroli、Davide Bonifazi
DOI:10.1021/ja807530m
日期:2009.1.21
through H-bonds between the complementary recognition sites, forming supramolecular architectures. Their symmetry depends upon the type of each individual subunit and the stoichiometry as well as on the combination and distribution of the main symmetry axes. These so-formed two-dimensional (2D) supramolecular oligomers have been studied in solution by optical spectroscopy and on highly ordered pyrolitic
呈现了在具有多边形多孔域的表面上的离散和多组分纳米级非共价组件。分子工程概念涉及多价分子模块,这些模块被预编程为通过利用互补的多个 H 键进行异分子识别。已经设计了两种类型的分子模块:(i)双重对称的线性单元,在其末端暴露两个 2,6-二(酰基氨基)吡啶 [供体-受体-供体 (DAD)] 识别位点,相对于(ii) 由 1,3,6,8-四乙炔芘核构成的角单元,外围功能化有四个尿嘧啶基团 [受体-供体-受体 (ADA)] 相互成 60 度和 120 度. 这些分子模块通过互补识别位点之间的氢键自组装,形成超分子结构。它们的对称性取决于每个单独亚基的类型和化学计量以及主要对称轴的组合和分布。这些如此形成的二维 (2D) 超分子低聚物已经在溶液中通过光谱学和在高度有序的热解石墨 (HOPG) 基材上通过固液界面的扫描隧道显微镜 (STM) 进行了研究。稳态 UV/vis 吸收和发射滴定测量表明多种