Surface Science and Coating Technologies, Empa, Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, 8600, Dübendorf, Switzerland.
Nanosurf Laboratory, Institute of Physics, The Czech Academy of Sciences, Cukrovarnická 10, 162 00, Prague, Czech Republic.
Chemphyschem. 2021 Feb 3;22(3):293-297. doi: 10.1002/cphc.202000853. Epub 2020 Dec 23.
The phenomenon of chiral crystallization into homochiral crystals is known for more than 170 years, yet it is still poorly understood. Studying crystallization on surfaces under well-defined condition seems a promising approach towards better understanding the intermolecular chiral recognition mechanisms during nucleation and growth. The two-dimensional aggregation of racemic trioxaundecahelicene on the single crystalline silver(100) surface has been investigated with scanning tunneling microscopy and with non-contact atomic force microscopy, as well as molecular modeling simulations. A transition from homochiral cluster motifs to heterochiral assembly into large islands with increasing coverage is observed. Force field modelling confirms higher stability of heterochiral arrangements from twelve molecules on. Results are discussed with respect to previous findings for the all-carbon heptahelicene on the same surface.
手性结晶形成等手性晶体的现象已经存在了 170 多年，但人们仍然对此知之甚少。在明确的条件下研究表面结晶似乎是一种很有前途的方法，可以更好地理解成核和生长过程中分子间的手性识别机制。使用扫描隧道显微镜和非接触原子力显微镜以及分子建模模拟研究了外消旋三氧杂十一烷在单晶银（100）表面上的二维聚集。随着覆盖率的增加，观察到从同手性簇图案到异手性组装成大岛的转变。力场建模证实，从 12 个分子开始，异手性排列的稳定性更高。结果与在同一表面上对全碳庚螺旋烯的先前发现进行了讨论。
