期刊
ADVANCED MATERIALS
卷 32, 期 2, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201905776
关键词
activation procedures; covalent organic frameworks; critical point drying; imine
类别
资金
- United States Army Research Office [W911NF-15-1-0447]
- Institute of International Education (IIE, USA) [2266/FNPDR/2017]
- NSF Graduate Research Fellowship [DGE-1324585]
- Northwestern University
- Dow Chemical Company
- Du Pont de Nemours, Inc.
- DOE Office of Science [DE-AC02-06CH11357]
- NSF [0960140]
- United States -India Educational Foundation (USIEF, India)
Imine-linked 2D covalent organic frameworks (COFs) form more rapidly than previously reported under Bronsted acid-catalyzed conditions, showing signs of crystallinity within a few minutes, and maximum crystallinity within hours. These observations contrast with the multiday reaction times typically employed under these conditions. In addition, vacuum activation, which is often used to isolate COF materials significantly erodes the crystallinity and surface area of the several isolated materials, as measured by N-2 sorption and X-ray diffraction. This loss of material quality during isolation for many networks has historically obscured otherwise effective polymerization conditions. The influence of the activation procedure is characterized in detail for three COFs, with the commonly used 1,3,5-tris(4-aminophenyl)benzene-terephthaldehyde network (TAPB-PDA COF), the most prone to pore collapse. When the networks are activated carefully, rapid COF formation is general for all five of the imine-linked 2D COFs studied, with all exhibiting excellent crystallinity and surface areas, including the highest surface areas reported to date for three materials. Furthermore, to simplify the workup of COF materials, a simple nitrogen flow method provides high-quality materials without the need for specialized equipment. These insights have important implications for studying and understanding how 2D COFs form.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据