Zn-based metal–organic frameworks (MOFs) of pyridinemethanol–carboxylate conjugated ligands: Deprotonation-dependent structures and CO 2 adsorption

摘要

Two Zn-based metal–organic frameworks (MOFs) of pyridinemethanol–carboxylate conjugated ligands, namely, [Zn(L1)]nxSol (1, 3D) and [Zn(L2)2]n(2, 1D) (H2L1?=?4-(6-(hydroxymethyl)pyridin-3-yl)benzoic acid; H2L2?=?3-(6-(hydroxymethyl)pyridin-3-yl)benzoic acid) have been synthesized and structurally characterized. The dimensionalities of1and2are defined by the deprotonation states of the ligands. Specifically, the 3D MOF1features a rod-shaped Zn–O/COO chain as the secondary building unit (SBU) which effectively hinder network interpenetration, whereas the 1D chain of2mimics an edge-sharing octahedron with each Zn center serving as the vertex. MOF1reversibly uptakes CO2and exhibits a Brunauer–Emmett–Teller (BET) surface of 345?m2?g?1, and remains crystalline upon activation, an indication of permanent porosity.