Building 2D Crystals from 5-Fold-Symmetric Molecules
Building 2D Crystals from 5-Fold-Symmetric Molecules
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DOI：
10.1021/ja8101083
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发表时间：
2009-03-18
影响因子：
15
通讯作者：
Ernst, Karl-Heinz
中科院分区：
文献类型：
--
作者：
Bauert, Tobias;Merz, Leo;Ernst, Karl-Heinz
讨论了5重对称巴基碗单层中的密堆积概念。当晶格的对称性和分子结构单元不相容时，新的策略就产生了。Corannulene在Cu（111）上通过倾斜远离C-5对称性并使一个六方环平行于表面而形成六方晶格。手性5重取代的氯和甲基衍生物不显示这种倾斜，并保持5重对称性作为吸附物。因此，观察到不完美的平铺。它们的晶格是准六边形的：一个是反平行的，几乎是pm对称的，另一个是在六边形网格上的方位角和位置无序的。我们的结果是在显着的协议与计算和力学模拟实验的紧密堆积的硬五边形盘在宏观二维系统，证明了这种建模策略的有效性。
Concepts of close packing in monolayers of 5-fold-symmetric buckybowls are discussed. When the symmetry of lattice and molecular building blocks are incompatible, new strategies evolve. Corannulene forms a hexagonal lattice on Cu(111) by tilting away from the C-5 symmetry and aligning one hexagonal ring parallel to the surface. The chiral 5-fold-substituted chloro and methyl derivatives do not show this tilt and maintain the 5-fold symmetry as adsorbates. Consequently, a nonperfect tiling is observed. Their lattices are quasi-hexagonal: one in an antiparallel fashion with almost pm symmetry and the other with azimuthal and positional disorder on the hexagonal grid. Our results are in remarkable agreement with computational and mechanical modeling experiments of close packing of hard pentagonal discs in macroscopic two-dimensional systems and prove the validity of such modeling strategies.