Metal-organic frameworks with N-(4-pyridylmethyl)iminodiacetate ligand: Synthesis, structure and sorption properties

Three novel metal-organic frameworks based on the N-(4-pyridylmethyl)iminodiacetate (pmida2−), namely {[Cd(pmida)H2O]·1.8 H2O]}n (1), {[Cd(pmida)(H2O)]·2H2O}n·(2) and {[Zn(pmida)(H2O)]·2H2O}n (3), have been prepared and characterized by single crystal X-ray diffraction, IR, powder X-ray diffraction (PXRD) and thermogravimetric analyses. Complex 1 has a unique irl topology and is a 3D framework with 1D open channels, whereas complexes 2 and 3 are isostructural 3D net with dia topology. Interestingly, complexes 1 and 2 obtained by the same reaction are supramolecular isomers with different 3D structures and topologies. Second-order non-linear optical (NLO) effect of the complexes, ferroelectric property of 1 as well as sorption properties of 1 and 3 were investigated.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Three-dimensional coordination frameworks with different structures and topologies. ► Selective sorption behavior of H2O, MeOH over N2, EtOH. ► Second-order non-linear optical effect and ferroelectric property.