Abstract
A new metal-organic compound, [Zn2Ca(bdc)3(H2O)2]n•x(solvent) (1 H2bdc = terephthalic acid), has been successfully constructed via the solvothermal reactions of H2bdc, Zn(NO3)2·6H2O and Ca(NO3)2·4H2O. Two symmetry-related Zn(II) ions and one Ca(II) are bridged by six bis-monodentate carboxylate groups together to form a heterometallic trinuclear [Zn2Ca(COO)6] cluster subunit. The linear bdc2− ligands further connected these trinuclear clusters into a 3D porous framework with 6-connected pcu topology. Remarkably, this porous compound can be stable up to 256 ℃ verified by the thermogravimetric analysis and powder X-ray diffraction analysis. Gas adsorption property investigations demonstrated that it shows high adsorption selectivity for CO2 over N2 at ambient conditions.
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