Two Interpenetrated Zn(II) Coordination Polymers: Synthesis, Topological Structures, and Property

Abstract

Two interpenetrated coordination polymers (CPs) {[Zn1(L)(NO2pbda)]n[Zn2(L)(NO2pbda)]n} (1) and [Zn(L)(Brpbda)]n (2) were prepared by reactions of zinc sulfate heptahydrate with N-donor ligands of 1,4-di(1H-imidazol-4-yl)benzene (L) and auxiliary carboxylic acids of nitroterephthalic acid (H2NO2pbda) and 2,5-dibromoterephthalic acid (H2Brpbda), respectively. The structures of the CPs were characterized by Fourier-Transform Infrared (IR) spectroscopy, elemental analysis, and single-crystal X-ray diffraction. The coordination polymer 1 has two different (4, 4) sql 2D layer structures based on the [Zn(L)(NO2pbda)] moiety, which results in inclined interpenetration with a 2D + 2D → 3D architecture, while the CP 2 exhibits a 3-fold interpenetrating dmp network. The diffuse reflectance spectra are also investigated for the CPs 1 and 2.

Two-Dimensional Metal-Organic Framework Materials: Synthesis, Structures, Properties and Applications

“…also reported two 2D MOFs with sql net, [Zn 2 (muco) 2 (azopy) 2 ]·3DMF·2H 2 O and [Cd­(muco)­(4bpdh)­(H 2 O)], based on trans , trans -muconate dianion (muco) and different linkers 4,4′-bisazobipyridine (azopy) and 2,5-bis­(4-pyridyl)-3,4-diaza-2,4-hexadiene (4bpdh), respectively. , The former one exhibits 2-fold interpenetration, while the latter displays 3-fold interpenetration (Figure ). Several other 2D MOFs of this type are reported in the recent literature. ,− …”

“…investigated a dynamic 2D MOF [Cu­(bpee)­(2-ntp)­(H 2 O) 2 ]·2H 2 O (2-ntp 2– = 2-nitroterephthalate), which display parallel/diagonal mode of inclined polycatenation between two similar sets of parallel sql sheets and capable as an efficient hydrogen storage material . Several other relevant examples are provided in the literature. ,,,− …”