Mesoscale Polarization by Geometric Frustration in Columnar Supramolecular Crystals.

Mesoscale Polarization by Geometric Frustration in Columnar Supramolecular Crystals.
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柱超分子晶体中的几何挫折中的中尺度极化。

DOI:
10.1002/anie.201612122
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发表时间:
2017-04-10
期刊:
Angewandte Chemie (International ed. in English)
影响因子:
--
通讯作者:
Senker J
Senker J
中科院分区:
其他
文献类型:
--
作者:
Zehe CS;Hill JA;Funnell NP;Kreger K;van der Zwan KP;Goodwin AL;Schmidt HW;Senker J

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具有沿沿着柱状轴极化的柱状超分子相具有开发高密度存储器的潜力,因为每一个单独的柱都可以用作存储元件。通过全X射线散射和DFT计算研究四种柱状苯-1,3,5-三酰胺的结构和无序,我们证明了如果柱聚集在六边形棒堆积中,则柱取向和柱偶极矩可以接受几何挫折。挫折抑制传统的反铁电秩序,并提高集体柱间堆积效应的敏感性。后者的发现允许建立中尺度域与自发极化。我们的研究结果表明,空间和静电相互作用之间的复杂的相互作用是如何影响一个简单的化学设计的分子电子产生自发极化和调整介观结构域的大小。
Columnar supramolecular phases with polarization along the columnar axis have potential for the development of ultrahigh‐density memories as every single column might function as a memory element. By investigating structure and disorder for four columnar benzene‐1,3,5‐trisamides by total X‐ray scattering and DFT calculations, we demonstrate that the column orientation, and thus the columnar dipole moment, is receptive to geometric frustration if the columns aggregate in a hexagonal rod packing. The frustration suppresses conventional antiferroelectric order and heightens the sensitivity towards collective intercolumnar packing effects. The latter finding allows for the building up of mesoscale domains with spontaneous polarization. Our results suggest how the complex interplay between steric and electrostatic interactions is influenced by a straightforward chemical design of the molecular synthons to create spontaneous polarization and to adjust mesoscale domain size.
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