Two-Dimensional Short-Range Disordered Crystalline Networks from Flexible Molecular Modules
Two-Dimensional Short-Range Disordered Crystalline Networks from Flexible Molecular Modules
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DOI：
10.1021/nn3007948
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发表时间：
2012-05-01
期刊：
影响因子：
17.1
通讯作者：
Barth, Johannes V.
中科院分区：
文献类型：
--
作者：
Ecija, David;Vijayaraghavan, Saranyan;Barth, Johannes V.
对复杂凝聚态系统的研究已经发现了具有意想不到的空间组织的材料，如玻璃、玻璃状晶体、准晶体、蛋白质和病毒晶体。在这里，我们提出了二维（2D）短程无序分子晶体网络，其中，关于空间组织，可以被认为是表面类似物的3D玻璃晶体。特别地，在Cu（111）上沉积柔性分子模块产生了不同的相，其特征已经通过扫描隧道显微镜在真实的空间中进行了研究：分别为2D短程畸变无序晶体网络和2D短程取向无序晶体网络。这两个阶段表现出随机排列的纳米孔，通过同时存在的金属-有机和吡啶基-吡啶基相互作用的稳定。二维短程扭曲无序晶体网络显示出有趣的灵活性，正如STM尖端所探测的那样，它可以改变孔隙形状，这是主客体过程中适应行为的先决条件。
Studies of complex condensed matter systems have led to the discovery of materials of unexpected spatial organization as glasses, glassy crystals, quasicrystals, and protein and virus crystals. Here, we present two-dimensional (2D) short-range disordered molecular crystalline networks, which, regarding spatial organization, can be considered as surface analogues of 3D glassy crystals. In particular, the deposition of a flexible molecular module on Cu(111) gives rise to distinct phases whose characteristics have been examined in real space by scanning tunneling microscopy: a 2D short-range distortional disordered crystalline network and a 2D short-range orientational disordered crystalline network, respectively. Both phases exhibit a random arrangement of nanopores that are stabilized by the simultaneous presence of metal-organic and pyridyl-pyridyl interactions. The 2D short-range distortional disordered crystalline network displayed intriguing flexibility, as probed by the STM tip that modifies the pore shape, a prerequisite for adaptive behavior in host-guest processes.