Article pubs.acs.org/IC
Cite This: Inorg. Chem. XXXX, XXX, XXX−XXX
Porous High-Valence Metal−Organic Framework Featuring Open Coordination Sites for Effective Water Adsorption Cong Wang, Yang-Hui Luo,* Xiao-Tong He, Dan-Li Hong, Jia-Ying Wang, Fang-Hui Chen, Chen Chen, and Bai-Wang Sun* School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, People’s Republic of China
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S Supporting Information *
ABSTRACT: The design and preparation of a porous high-valence metal−organic framework (MOF) featuring open coordination sites are of utmost importance for the development of adsorbent materials. Here in this work, the threedimensional (3D) high-valence MOF [Er(dcbp)3/2(DMF)(H2O)2]·2H2O (HV-MOF-1; H2dcbp = 4,4′-dicarboxy-2,2′bipyridine, DMF = N,N-dimethylformamide), which possesses permanent porosity and two open coordination sites, has been prepared and characterized. In the 3D framework, the dcbp molecules display two different bridging styles, resulting in ordered diamondlike pores with bared carboxyl oxygen and pyridine nitrogen atoms on dcbp exposed directly to the pores, generating hydrophilic characteristics and high water affinity. In addition, the open coordination sites act as arms to fix the adsorbed water molecules, providing high water adsorption capacity (5.95 mmol g−1) and selectivity. More importantly, the activated HVMOF-1 species shows an energy-saving step for recycling (operation under 120 °C), demonstrating promise as a candidate for an adsorbent material with considerable water adsorption−desorption cycles.
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INTRODUCTION Water is the world’s most important molecule and is of fundamental importance in life-sustaining biological, chemical, and geological processes.1−3 In addition, as water is everywhere, the control of water adsorption in microporous solids is of utmost importance for the development of water-related industrial processes, such as gas storage and separation, gas transport and sequestration, sensing, catalysis, proton conduction, and so on.4−10 This has thus promotes the development of excellent porous coordination polymers with appropriate water sensitivity or insensitivity.11,12 For instance, to achieve ideal industrial gas transport and sequestration, an effective removal of trace amounts of water by using hydrolytically stable adsorbent materials is highly desirable.13−15 For this purpose, the more efficient adsorbent materials should show high water selectivity and affinity in the presence of other components, considerable water uptake ability at low partial pressures, and low energy costs associated with the activation, regeneration, and recycling (at temperatures
