Urea-Linked Covalent Organic Frameworks

• DOI: 10.1021/jacs.8b10612
• Publication Date: 2018-11-15T18:48:26Z
• Authors: Chenfei Zhao; Christian S. Diercks; Chenhui Zhu; Nikita Hanikel; Xiaokun Pei; Omar M. Yaghi
• Keywords: Covalent organic framework; Biphenyl

2D covalent organic frameworks (COFs) with flexible urea linkages have been synthesized by condensation of 1,3,5-triformylphloroglucinol (TFP) 1,4-phenylenediurea (BDU) or 1,1′-(3,3′-dimethyl-[1,1′-biphenyl]-4,4′-diyl)diurea (DMBDU). The resulting COF-117 and COF-118 undergo reversible structural dynamics within their layers, in response to inclusion removal guest molecules, emanating from C—N bond rotation interlayer hydrogen-bonding interactions. These compounds are the first urea-linked COFs, serving expand scope reticular chemistry.