title: 3D microporous base-functionalized covalent organic frameworks for size-selective catalysis.
abstract: The design and synthesis of 3D covalent organic frameworks (COFs) have been considered a challenge, and the demonstrated applications of 3D COFs have so far been limited to gas adsorption. Herein we describe the design and synthesis of two new 3D microporous base-functionalized COFs, termed BF-COF-1 and BF-COF-2, by the use of a tetrahedral alkyl amine, 1,3,5,7-tetraaminoadamantane (TAA), combined with 1,3,5-triformylbenzene (TFB) or triformylphloroglucinol (TFP). As catalysts, both BF-COFs showed remarkable conversion (96% for BF-COF-1 and 98% for BF-COF-2), high size selectivity, and good recyclability in base-catalyzed Knoevenagel condensation reactions. This study suggests that porous functionalized 3D COFs could be a promising new class of shape-selective catalysts.
authors.affiliation: Department of Chemical and Biomolecular Engineering, Center for Catalytic Science and Technology, University of Delaware, Newark, DE 19716 (USA).
authors.forename: Qianrong
authors.initials: Q
authors.lastname: Fang
authors.forename: Shuang
authors.initials: S
authors.lastname: Gu
authors.forename: Jie
authors.initials: J
authors.lastname: Zheng
authors.forename: Zhongbin
authors.initials: Z
authors.lastname: Zhuang
authors.forename: Shilun
authors.initials: S
authors.lastname: Qiu
authors.forename: Yushan
authors.initials: Y
authors.lastname: Yan
keywords: covalent organic frameworks; crystalline materials; functionalized materials; heterogeneous catalysis; porous materials