Synthesis, structural characterization, water ad-/de-sorption isotherm, and CO2 uptakes of a 2D Cu(I) metal organic framework with 1,3,5-tris(4-pyridylethynyl)benzene (L) and Tricyanomethanide (tcm−) ligands

Abstract

A d¹⁰ Cu(I) two-dimensional (2D) metal–organic framework (MOF) with chemical formulas, {[Cd(L)(tcm)(H₂O)]⋅2H₂O}_n (1) (L = 1,3,5-tris(4-pyridylethynyl)benzene; tcm⁻¹ = tricyanomethanide) was synthesized and structurally characterized by single crystal X-ray diffraction method. In 1, the coordination geometry of Cu(I) ion is distorted tetrahedral coordinated to four N atoms from three L and one tcm⁻ ligands. A 2D puckered honeycomb-like layer is formed via the bridges of Cu(I) ions and L ligands with tris-monodentate coordination mode. Two 2D layers are mutually interpenetrated via the π–π stacking interaction between benzene ring of L ligand and pyridyl ring of neighboring L ligand to form a two-fold interpenetrated 2D net and then arranged orderly to construct its 3D supramolecular network. Thermal stability and in-situ temperature-dependent structural variations of 1 are performed by TG analysis associated with temperature-dependent PXRD measurement. The water vapor ad-/de-sorption isotherm and CO₂ adsorption isotherm of 1 are measured and discussed.