3D Covalent Organic Frameworks Selectively Crystallized through Conformational Design,Journal of the American Chemical Society

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3D Covalent Organic Frameworks Selectively Crystallized through Conformational Design
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2020-11-13 , DOI: 10.1021/jacs.0c11064
Ha L Nguyen _{1,

2} , Cornelius Gropp ₁ , Yanhang Ma ₃ , Chenhui Zhu ₄ , Omar M Yaghi _{1,

2}

Affiliation

We present a strategy whereby selective formation of imine covalent organic frameworks (COFs) based on linking of triangles and squares into the fjh topology was achieved by the conformational design of the building units. 1,3,5-Trimethyl-2,4,6-tris(4-formylphenyl)benzene (TTFB, triangle) and 1,1,2,2-tetrakis(4-aminophenyl)ethene (ETTA, square) were reticulated into [(TTFB)4(ETTA)3]imine, termed COF-790, which was fully characterized by spectroscopic, microscopic, and X-ray diffraction techniques. COF-790 exhibits permanent porosity and a Brunauer-Emmett-Teller (BET) surface area of 2650 m2 g-1. Key to the formation of this COF in crystalline form is the pre-designed conformation of the triangle and the square units to give dihedral angles in the range of 75-90°, without which the reaction results in the formation of amorphous product. We demonstrate the versatility of our strategy by also reporting the synthesis and characterization of two isoreticular forms of COF-790, COF-791 and COF-792, based on other square building units.

中文翻译：

通过构象设计选择性结晶的 3D 共价有机框架

我们提出了一种策略，通过构建单元的构象设计，基于将三角形和正方形连接成 fjh 拓扑来选择性地形成亚胺共价有机框架（COF）。 1,3,5-三甲基-2,4,6-三(4-甲酰基苯基)苯（TTFB，三角形）和1,1,2,2-四（4-氨基苯基）乙烯（ETTA，正方形）网状[(TTFB)4(ETTA)3]亚胺，称为COF-790，通过光谱、显微镜和X射线衍射技术对其进行了充分表征。 COF-790 具有永久孔隙率和 2650 m2 g-1 的 Brunauer-Emmett-Teller (BET) 表面积。形成这种晶体形式的 COF 的关键是预先设计的三角形和正方形单元的构象，以提供 75-90° 范围内的二面角，否则反应会导致形成无定形产物。我们还报告了基于其他方形建筑单元的 COF-790、COF-791 和 COF-792 两种等网状形式的合成和表征，证明了我们策略的多功能性。

更新日期：2020-11-13

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