Three-dimensional coordination polymers constructed from C2-symmetric linkers of pyridyl dicarboxylate ligands

Abstract

Two zinc(II) metal–organic frameworks (MOFs), {[Zn(L₁)]·DMF}_∞ (1) with tubular channels along the a axis, and {[Zn(L₂)]·DMF}_∞ (2) with Zn–(COO)–Zn chains, have been constructed based on 5-(pyridin-4-yl)isophthalic acid (H₂L₁) and 4,4′-(pyridine-3,5-diyl)dibenzoic acid (H₂L₂) with Zn²⁺, respectively. Both of the MOFs were characterized by IR spectroscopy, thermogravimetry, single crystal and powder X-ray diffraction methods. Network analysis reveals that 1 is 3,6-connected binodal net with the rtl topology and 2 forms a 5-connected uninodal net with the bnn topology. Additionally, the porosity of MOF 1 was confirmed by N₂ and CO₂ gas adsorption.