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一种有弹性的主链紧密相连的金属有机晶体
作者:小柯机器人 发布时间:2021/10/17 16:11:25

日本东京大学Sato, Hiroshi团队开发出一种有弹性的主链紧密相连的金属有机晶体。相关研究成果发表在2021年10月13日出版的《自然》。

自1970年第一次报道聚环烷和聚轮烷以来,由机械互锁组成的材料的特定机械性能一直是材料科学中的长期存在的一个问题。

该文中,研究人员报告了一种三维多孔金属-有机晶体,其独特之处在于其经纱和纬纱仅通过链状连接。该多孔晶体由四方晶格组成,在客体分子释放、吸收和交换时,以及在低温范围内温度变化时,动态改变其几何形状。研究人员沿着a/b轴对晶体进行了压痕,得到了N,N-二甲基甲酰胺中的杨氏模量为1.77±0.16GPa,四氢呋喃中的杨氏模量为1.63±0.13GPa,是迄今为止报道的多孔金属-有机晶体的杨氏模量中最低的。

令人惊讶的是,静水压显示该弹性多孔晶体沿其c轴最易变形,当压缩至0.88GPa时,5%的收缩发生而没有结构退化。在0.46GPa下获得的晶体结构表明,链状大环在收缩时平移移动。研究人员预计,基于机械联锁分子的设计将成为开发具有奇特机械性能的多孔材料的起点。例如,可挤压多孔晶体有望解决实现客体高吸收和释放能力的根本困难。

附:英文原文

Title: An elastic metal–organic crystal with a densely catenated backbone

Author: Meng, Wenjing, Kondo, Shun, Ito, Takuji, Komatsu, Kazuki, Pirillo, Jenny, Hijikata, Yuh, Ikuhara, Yuichi, Aida, Takuzo, Sato, Hiroshi

Issue&Volume: 2021-10-13

Abstract: What particular mechanical properties can be expected for materials composed of interlocked backbones has been a long-standing issue in materials science since the first reports on polycatenane and polyrotaxane in the 1970s1,2,3. Here we report a three-dimensional porous metal–organic crystal, which is exceptional in that its warps and wefts are connected only by catenation. This porous crystal is composed of a tetragonal lattice and dynamically changes its geometry upon guest molecule release, uptake and exchange, and also upon temperature variation even in a low temperature range. We indented4 the crystal along its a/b axes and obtained the Young’s moduli of 1.77±0.16GPa in N,N-dimethylformamide and 1.63±0.13GPa in tetrahydrofuran, which are the lowest among those reported so far for porous metal–organic crystals5. To our surprise, hydrostatic compression showed that this elastic porous crystal was the most deformable along its c axis, where 5% contraction occurred without structural deterioration upon compression up to 0.88GPa. The crystal structure obtained at 0.46GPa showed that the catenated macrocycles move translationally upon contraction. We anticipate our mechanically interlocked molecule-based design to be a starting point for the development of porous materials with exotic mechanical properties. For example, squeezable porous crystals that may address an essential difficulty in realizing both high abilities of guest uptake and release are on the horizon.

DOI: 10.1038/s41586-021-03880-x

Source: https://www.nature.com/articles/s41586-021-03880-x

期刊信息

Nature:《自然》,创刊于1869年。隶属于施普林格·自然出版集团,最新IF:42.778
官方网址:http://www.nature.com/