Inside polyMOFs: layered structures in polymer-based metal–organic frameworks,Chemical Science

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Inside polyMOFs: layered structures in polymer-based metal–organic frameworks
Chemical Science ( IF 7.6 ) Pub Date : 2020-09-15 , DOI: 10.1039/d0sc03651j
Kyle C. Bentz _{1,

2,

3,

4} , Karthikeyan Gnanasekaran _{5,

6,

7,

8,

9} , Jake B. Bailey _{1,

2,

3,

4} , Sergio Ayala _{1,

2,

3,

4} , F. Akif Tezcan _{1,

2,

3,

4} , Nathan C. Gianneschi _{5,

6,

7,

8,

9} , Seth M. Cohen _{1,

2,

3,

4}

Affiliation

In this report, we explore the internal structural features of polyMOFs consisting of equal mass ratios of metal-coordinating poly(benzenedicarboxylic acid) blocks and non-coordinating poly(ethylene glycol) (PEG) blocks. The studies reveal alternating lamellae of metal-rich, crystalline regions and metal-deficient non-crystalline polymer, which span the length of hundreds of nanometers. Polymers consisting of random PEG blocks, PEG end-blocks, or non-coordinating poly(cyclooctadiene) (COD) show similar alternation of metal-rich and metal-deficient regions, indicating a universal self-assembly mechanism. A variety of techniques were employed to interrogate the internal structure of the polyMOFs, including transmission electron microscopy (TEM), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and small-angle synchrotron X-ray scattering (SAXS). Independent of the copolymer architecture or composition, the internal structure of the polyMOF crystals showed similar lamellar self-assembly at single-nanometer length scales.

中文翻译：

polyMOF内部：聚合物基金属-有机框架中的分层结构

在本报告中，我们探讨了由金属配位的聚（苯二甲酸）嵌段和非配位的聚（乙二醇）（PEG）嵌段的等质量比组成的polyMOF的内部结构特征。研究表明，富含金属的结晶区域和缺乏金属的非晶态聚合物的交替层片，其长度为数百纳米。由无规PEG嵌段，PEG末端嵌段或非配位聚（环辛二烯）（COD）组成的聚合物显示出富金属和缺金属区域的相似交替，表明普遍的自组装机制。多种技术被用于询问polyMOF的内部结构，包括透射电子显微镜（TEM），扫描电子显微镜（SEM），能量色散X射线光谱（EDS），小角度同步加速器X射线散射（SAXS）。与共聚物的结构或组成无关，polyMOF晶体的内部结构在单纳米长度尺度上显示出相似的层状自组装。

更新日期：2020-10-07

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