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

Abstract

A three-component reaction between the 1,4-benzenedicarboxylic (terephthalic) acid (H2bdc), 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 {[Zn3(DMF)(btrm)(bdc)3]·nDMF}∞ and {[Zn3(btrm)(bdc)3]·nDMF}∞ containing trinuclear {Zn3(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 Zn2+ cations joined by bdc2− and btrm linkers into a two-fold interpenetrated network. Upon activation, MOF [Zn3(btrm)(bdc)3]∞ demonstrated CO2/N2 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.

Photoluminescent Lanthanide(III) Coordination Polymers with Bis(1,2,4-Triazol-1-yl)Methane Linker

“…The coordination chemistry of bis(1,2,4-triazol-1-yl)methane (btrm, Scheme 1) is much less explored. Despite the fact that coordination polymers and metal-organic frameworks based on btrm and transition metal cations showing luminescent and gas adsorption properties were reported [37][38][39][40][41][42], there are no examples of lanthanide coordination compounds based on btrm or similar ligands in the literature.…”

“…The coordination chemistry of bis(1,2,4-triazol-1-yl)methane (btrm, Scheme 1) is much less explored. Despite the fact that coordination polymers and metal-organic frameworks based on btrm and transition metal cations showing luminescent and gas adsorption properties were reported [37][38][39][40][41][42], there are no examples of lanthanide coordination compounds based on btrm or similar ligands in the literature. In this work, we report the synthesis, structural characterization, and luminescent properties of the first examples of lanthanide(III) coordination polymers with bis(1,2,4triazol-1-yl)methane as a linker.…”