Jing Chao, Zhang Bodong, Synkule Sabine, Ebrahimi Maryam, Riss Alexander, Auwärter Willi, Jiang Li, Médard Guillaume, Reichert Joachim, Barth Johannes V, Papageorgiou Anthoula C
Physics Department E20, Technical University of Munich, James Franck Straße 1, 85748, Garching, Germany.
Key Laboratory for Advanced Materials, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai, 200237, P. R. China.
Angew Chem Int Ed Engl. 2019 Dec 19;58(52):18948-18956. doi: 10.1002/anie.201912247. Epub 2019 Nov 27.
Linear modules equipped with two terminal hydroxamic acid groups act as the building block of diverse two-dimensional supramolecular motifs and patterns with room-temperature stability on the close-packed single-crystal surfaces of silver and gold, revealing a complex self-assembly scenario. By combining multiple investigation techniques (scanning tunneling microscopy, atomic force microscopy, X-ray photoelectron spectroscopy, and density functional theory calculations), we analyze the characteristics of the ordered assemblies which range from close-packed structures to polyporous networks featuring an exceptionally extended primitive unit cell with a side length exceeding 7 nm. The polyporous network shows potential for hosting and promoting the formation of chiral supramolecules, whereas a transition from 1D chiral randomness to an ordered racemate is discovered in a different porous phase. We correlate the observed structural changes to the adaptivity of the building block and surface-induced changes in the chemical state of the hydroxamic acid functional group.
配备两个末端异羟肟酸基团的线性模块作为多种二维超分子基序和图案的构建单元，在银和金的密排单晶表面上具有室温稳定性，揭示了一个复杂的自组装过程。通过结合多种研究技术（扫描隧道显微镜、原子力显微镜、X射线光电子能谱和密度泛函理论计算），我们分析了有序组装体的特征，其范围从密排结构到具有边长超过7 nm的异常扩展的原始晶胞的多孔网络。该多孔网络显示出容纳和促进手性超分子形成的潜力，而在不同的多孔相中发现了从一维手性无序到有序外消旋体的转变。我们将观察到的结构变化与构建单元的适应性以及表面诱导的异羟肟酸官能团化学状态的变化联系起来。
