Dipeptide Crystals as Excellent Permselective Materials: Sequential Exclusion of Argon, Nitrogen, and Oxygen
Dipeptide Crystals as Excellent Permselective Materials: Sequential Exclusion of Argon, Nitrogen, and Oxygen
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DOI：
10.1002/anie.201000007
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发表时间：
2010-01-01
影响因子：
16.6
通讯作者：
Gales, Luis
中科院分区：
文献类型：
--
作者：
Afonso, Rui V.;Durao, Joana;Gales, Luis
利用多孔固体进行气体储存和气体分离是一项重要的技术，由于其环境和能源方面的应用而引起了人们的极大关注。高度多孔的材料，如沸石，硅酸盐和碳基材料，[1]具有长期的特定应用。新应用程序的关键是开发新的框架。气体吸附能力的进步是通过合成诸如金属有机框架（MOFs）、有机聚合物和微孔有机晶体等材料实现的。[2]最近，由二肽形成的晶体被测试为吸附剂[3]，在氢气吸收和从二氧化碳中纯化甲烷方面具有显着的结果。[3b]二肽可以形成具有可调尺寸通道的微孔材料。虽然二肽通过氢键网络自组装，但晶体基质在客体分子交换时是保守的。此外，结晶二肽显示出非常高密度的具有非常低曲折度的单一尺寸微孔，这使得它们成为用于储存或选择性分离目的的优异材料。最后，结晶二肽的孔是完全对齐的（沿着结晶学c轴），这表明它们是用作渗透选择性屏障的优秀候选者。在此，我们首次报道了二肽晶体作为选择性渗透材料的应用。虽然这看起来像是晶体中存在的多孔拓扑结构的一种明显的工程应用，但存在需要实验支持的问题：1）潜在的晶体缺陷，例如孪生或断裂，可能会大大降低其实际选择性; 2）晶体结构的刚性的潜在缺乏允许孔在一定程度上适应客体分子的大小。矩阵的动态行为
Gas storage and gas separation using porous solids are important technologies that have attracted great attention because of their environmental and energetic applications. Highly porous materials, such as zeolites, silicate, and carbonbased materials,[1] have long-established specific applications. The key for new applications is the development of new frameworks. Advances in gas sorption capacities were achieved through the synthesis of materials such as metal–organic frameworks (MOFs), organic polymers, and microporous organic crystals.[2] Recently, crystals formed by dipeptides were tested as adsorbents [3] with significant results in hydrogen absorption and methane purification from carbon dioxide.[3b]Dipeptides can form microporous materials with channels of tunable size. Although the dipeptides self-assemble through a net of hydrogen bonds, the crystal matrix is conserved upon exchange of guest molecules. Moreover, crystalline dipeptides show a very high density of single-size micropores with very low tortuosity, which makes them excellent materials for storage or selective separation purposes. Finally, there is the remarkable feature that pores of crystalline dipeptides are perfectly aligned (along the crystallographic c axis), which indicates that they are excellent candidates for use as permeation-selective barriers. Herein, we report for the first time the use of dipeptide crystals as permselective materials. Although this looks like an obvious engineering application for the kind of porous topology present in the crystals, there are issues that call for experimental support: 1) potential crystal defects, such as twinning or fractures, may greatly diminish their actual selectivity; and 2) the potential lack of rigidity of the crystal structure allows the pores to adapt to some extent to the size of the guest molecules. The dynamic behavior of the matrix of