Water Sorption Evolution Enabled by Reticular Construction of Zirconium Metal–Organic Frameworks Based on a Unique [2.2]Paracyclophane Scaffold

• DOI: 10.1021/jacs.1c11836
• Publication Date: 2022-01-21T21:53:18Z
• Authors: Wei Gong; Haomiao Xie; Karam B. Idrees; Florencia A. Son; Zhijie Chen; Fanrui Sha; Yan Liu; Yong Cui; Omar K. Farha
• Keywords: Carboxylate; Trifluoroacetic acid

Water vapor sorption by metal-organic frameworks (MOFs) has gathered significant interest because of its prominent potential in many applications such as moisture harvesting, dehumidification, heat pump regulation, and hydrolysis catalysis. However, the reticular design exploration robust high-performing Zr-MOFs for purposes remains a sought-after endeavor. In this work, we present deployment chemistry to target series based on unique [2.2]paracyclophane (PCP) scaffold. The ease functionalization PCP enables desired synthesis three carboxylate linkers, one ditopic two tetratopic, which further assemble into total five with distinct topological structures, i.e., new 2D net (NU-700), fcu (NU-405), flu (NU-1800), she (NU-602), scu (NU-913). Notably, water performances all are highly dependent their framework topology pore metric, NU-602 NU-913 uniform 1D channels exhibit S-shaped isotherms steep pore-filling step high uptake capacities 0.72 g g-1 at 70% relative humidity (RH) 0.88 60% RH, respectively. Moreover, displays exceptionally working capacity range 40-60% RH. Additionally, demonstrate that hydrolytic stability adsorption-desorption recyclability can be remarkably improved capping Zr6 nodes more hydrophobic agent, trifluoroacetic acid, making it candidate sorption-based applications.