Abstract
The coordination polymer, namely, [Cd(H2L)(nobda)]n (1) was prepared by the reaction of Cd(NO3)2·4H2O with 4-amino-1,2-benzenedicarboxylic acid (H2nobda) and 1,4-di(1H-imidazol-4-yl)benzene (H2L), and characterized by single-crystal X-ray diffraction, elemental analysis, infrared (IR) spectroscopy, thermogravimetric analysis, and powder X-ray diffraction (PXRD). The carboxylic acid of H2nobda ligands was completely deprotonated to be nobda2− anions, which act as tridentate ligand to connect the Cd2+ to form two-dimensional (2D) network, while the neutral H2L ligands serve as a linear didentate bridge to connect two adjacent Cd2+ ions upper and down the 2D layer. The adjacent 2D layers were further linked into the three-dimensional (3D) supramolecular polymer by the weak interactions such as hydrogen bonds and π−π stacking interactions. The ultraviolet-visible (UV-vis) absorption spectra and luminescent properties in the solid state at room temperature have been investigated.
Highlights
In the past decades, the crystalline material of coordination polymers (CPs) has become an expanding research topic, due to their fascinating architectures and captivating topologies [1,2,3], and for their potent applications in the fields of luminescence [4], gas adsorption/separation [5], chemical sensors [6], heterogeneous catalysis [7], and so on
Because the coordination polymers are composed of the metal ion and organic ligands, that is, the nature of metal ion and organic ligands are most important factors for constructing targeted CPs with desired properties [8,9,10]
The Yaghi group has designed a series of carboxylic acid with expanded and variously functionalized organic linkers, and has made a prominent contribution for the construction of porous CPs by reticular synthesis based on metal paddle-wheel building or infinite metal-carboxylate secondary building units (SBUs) [11,12]
Summary
The crystalline material of coordination polymers (CPs) has become an expanding research topic, due to their fascinating architectures and captivating topologies [1,2,3], and for their potent applications in the fields of luminescence [4], gas adsorption/separation [5], chemical sensors [6], heterogeneous catalysis [7], and so on. The design of organic ligands is the key factor to build CPs. O-donor carboxylic acids are extensively employed to build diverse CPs, due to their versatile coordination modes. CPs with functional modifications exhibit favorable gas adsorption, which are typically selective gas adsorption properties for CO2 or alkanes, and they can potentially alleviate the greenhouse effect or be employed as carriers to store energy gas [13,14]. Polyazaheteroaromatic ligands, another series of N-donor ligands, including the imidazole, trizole and tetrazole, are successfully used to construct coordination. The UV-vis absorption spectra and luminescent properties in the solid state at room temperature have been investigated
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