3D Covalent Organic Frameworks Selectively Crystallized through Conformational Design
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https://figshare.com/articles/dataset/3D_Covalent_Organic_Frameworks_Selectively_Crystallized_through_Conformational_Design/13237258
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资源简介：
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.
创建时间：
2020-11-13
