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.