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.
Highlights
The design of metal–organic coordination polymers (CPs), as one of the most active research areas, has acquired great attention in recent years, due to their intriguing structures and significant applications [1,2,3,4,5,6,7]
We report two Zn(II) CPs of {[Zn1(L)(NO2 pbda)]n [Zn2(L)(NO2 pbda)]n }
Single-crystal structural analysis reveals that CP 1 crystallizes in a monoclinic form with space group P 1 (Table 1)
Summary
The design of metal–organic coordination polymers (CPs), as one of the most active research areas, has acquired great attention in recent years, due to their intriguing structures and significant applications [1,2,3,4,5,6,7]. Luminescent coordination polymers have been widely employed to detect guest molecules with high sensitivity and selectivity. The most important factors in assembling desirable CPs are the rational choosing of the bridging ligand and metal centers; in addition, other reaction conditions, such as solvent, temperature, pH value, and the nature of anions, can affect the resulting framework [9,10,11,12,13]. It should be mentioned that the length, rigidity, functional groups, coordination modes, or substituents of organic ligands can decide the final frameworks of CPs [14,15].
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