Structural Diversity and Carbon Dioxide Sorption Selectivity of Zinc(II) Metal-Organic Frameworks Based on Bis(1,2,4-triazol-1-yl)methane and Terephthalic Acid

A three-component reaction between the 1,4-benzenedicarboxylic (terephthalic) acid (H(2)bdc), bis(1,2,4-triazol-1-yl)methane (btrm) and zinc nitrate was studied, and three new coordination polymers were isolated by a careful selection of the reaction conditions. Coordination polymers {[Zn(3)(DMF)(btrm)(bdc)(3)]·nDMF}(∞) and {[Zn(3)(btrm)(bdc)(3)]·nDMF}(∞) containing trinuclear {Zn(3)(bdc)(3)} secondary building units are joined by btrm auxiliary linkers into three-dimensional metal–organic frameworks. The coordination polymer {[Zn(bdc)(btrm)]∙nDMF}(∞) consists of Zn(2+) cations joined by bdc(2−) and btrm linkers into a two-fold interpenetrated network. Upon activation, MOF [Zn(3)(btrm)(bdc)(3)](∞) demonstrated CO(2)/N(2) adsorption selectivity with an ideal adsorbed solution theory (IAST) factor of 21. All three MOF demonstrated photoluminescence with a maximum near 435–440 nm upon excitation at 330 nm.