Synthesis, structure and properties of a novel metal-organic coordination polymer, Zn(NH_3)_2(BDC)_n

摘要

A novel one-dimensional metal-organic coordination polymer, [Zn(NH_3)_2(BDC)]_n (BDC=1,4-benzenedicaboxylate), has been synthesized by solvent evaporation method through self-assembly of Zn(II) salts with terephthalic acid ligand in ammonia aqueous solution. Single crystal X-ray diffraction analysis indicated that each Zn(II) was coordinated by two nitrogen donors from two NH_3 and two oxygen counter donors from terephthalic acid ligand. The adjacent zigzag chains are arranged in a parallel fashion and linked by interchain hydrogen bonding interaction and π-π stacking interactions into higher-dimensional framework. The compound has also been characterized by CHN elemental analyses, Single crystal X-ray diffraction analysis, powder X-ray diffraction (PXRD) analysis, Fourier transform infrared (FT-IR) spectra, Thermalgravimetric-differential scanning calorimetric (TG-DSC) and Solid-state nuclear magnetic resonance (NMR), etc. Results showed that the framework of compound was stable at the temperature up to 246°C. The desolvated product [Zn(BDC)]_n, which was obtained by removal of molecular NH_3 from [Zn(NH_3)_2(BDC)]_n, can be transferred to the different skeleton structures through coordinating different small hydrogen-bond-forming molecules.