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A Polyhedron-Based Heterometallic MOF Constructed by HSAB Theory and SBB Strategy: Synthesis, Structure, and Adsorption Properties

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journal contribution
posted on 24.06.2019, 00:00 by Dongmei Wang, Yuxiao Zhang, Jiali Gao, Genwu Ge, Chunxia Li
Metal–organic frameworks (MOFs) with high porosity and good stability are a booming class of adsorbent materials exhibiting extensive gas adsorption and separation. In this work, a polyhedral heterometallic MOF, [InCu2(CBDA)2(H2O)2n(solvent) (In/Cu-CBDA) [CBDA = 5,5′-(carbonylbis­(azanediyl))-diisophthalic acid], on the basis of tetracarboxylic ligand, has been successfully obtained by one-step synthesis. Based on the theory of hard and soft acid–base (HSAB), the formation of strong coordination bonds (high-valency In-carboxylate) results in excellent stability of In/Cu-CBDA when heated at 150 °C, exposured to the air, and soaked in the organic solvents. By utilizing a supermolecular building block (SBB) strategy, the coordination between isophthalate moieties and Cu­(II) paddlewheels provides a platform for assembly of a metal–organic polyhedron (MOP), so that the In/Cu-CBDA displays permanent porosity and high adsorption selectivity of CO2/CH4, C2H6/CH4, and C3H8/CH4 as predicted by IAST. This work affords an idea to design and synthesize target MOF materials for broad possibilities in advanced applications through a combination of HSAB theory and SBB strategy.