Ordering, flexibility and frustration in arrays of porphyrin nanorings.
Ordering, flexibility and frustration in arrays of porphyrin nanorings.
复制标题
卟啉纳米环阵列的有序性、灵活性和挫败性。
DOI：
10.1038/s41467-019-11009-y
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发表时间：
2019
影响因子：
16.6
通讯作者：
Summerfield A
中科院分区：
文献类型：
--
作者：
Summerfield A
原子、分子和纳米颗粒的规则堆积为理解物质凝聚相内的结构顺序提供了基础。通常，组成颗粒被认为是具有固定形状的刚性。在这里，我们通过对环状卟啉聚合物、纳米环在石墨表面上的吸附的综合实验和数值研究表明，柔性分子可以表现出丰富而复杂的堆积行为。根据纳米环内卟啉亚单元的数量，我们观察到高度有序的六方相或由方向相互作用驱动的受挫堆积，对于某些排列与环状聚合物的内部变形相结合。由于具有这种内部对称性的纳米环不能同时实现相邻基团的紧密堆积和共排列，因此在具有十个子单元的聚合物阵列中会发生挫败和变形。
The regular packing of atoms, molecules and nanoparticles provides the basis for the understanding of structural order within condensed phases of matter. Typically the constituent particles are considered to be rigid with a fixed shape. Here we show, through a combined experimental and numerical study of the adsorption of cyclic porphyrin polymers, nanorings, on a graphite surface, that flexible molecules can exhibit a rich and complex packing behaviour. Depending on the number of porphyrin sub-units within the nanoring we observe either a highly ordered hexagonal phase or frustrated packing driven by directional interactions which for some arrangements is combined with the internal deformation of the cyclic polymer. Frustration and deformation occur in arrays of polymers with ten sub-units since close packing and co-alignment of neighbouring groups cannot be simultaneously realised for nanorings with this internal symmetry.