Heininger Christoph, Kampschulte Lorenz, Heckl Wolfgang M, Lackinger Markus
Department for Earth and Environmental Sciences, Ludwig-Maximilians-University and Center for NanoScience (CeNS), Theresienstrasse 41, DE-80333 Munchen, Germany.
Langmuir. 2009 Jan 20;25(2):968-72. doi: 10.1021/la803055p.
Self-assembly into two-dimensionally ordered supramolecular structures of three aromatic dicarboxylic acids-2,6-naphthalenedicarboxylic acid (NDA), 4,4'-biphenyldicarboxylic acid (BPDA), and 4,4'-stilbenedicarboxylic acid (SDA)-is studied at the liquid-solid interface by scanning tunneling microscopy. All compounds possess structural similarities, namely, two interconnected aromatic moieties and functionalization through two carboxylic groups in linear configuration. For all molecules, ordered monolayers were observed on a graphite substrate, and the resulting structures can be described as a dense packing of one-dimensionally hydrogen-bonded rows. However, concerning the stability of the adsorbate layers, the average domain size, and the degree of order, distinct differences were noticed. Supported by density functional theory (DFT) calculations, these differences are analyzed and explained as a consequence of molecular structure, adsorption geometry, and adsorption energy.
通过扫描隧道显微镜在液-固界面研究了三种芳香二羧酸——2,6-萘二甲酸（NDA）、4,4'-联苯二甲酸（BPDA）和4,4'-二苯乙烯二甲酸（SDA）自组装成二维有序超分子结构的情况。所有化合物都具有结构相似性，即两个相互连接的芳香部分以及通过两个呈线性构型的羧基进行功能化。对于所有分子，在石墨基底上均观察到有序单层，所得结构可描述为一维氢键连接的行的密集堆积。然而，关于吸附层的稳定性、平均畴尺寸和有序度，发现了明显差异。在密度泛函理论（DFT）计算的支持下，这些差异被分析并解释为分子结构、吸附几何构型和吸附能的结果。
