Syntheses, structures, and fluorescent properties of two new Zn(II) coordination polymers containing 2-((benzoimidazol-yl)methyl)-1H-tetrazole

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Two coordination polymers, {[Zn(bdc)(bimt)2]H2O}n (1) and {[Zn1.5(btc)(bimt)(H2O)3]H2ODMF}n (2), have been synthesized through reactions of 2-((benzoimidazol-yl)methyl)-1H-tetrazole (bimt) with Zn(NO3)2 6H2O in the presence of 1,4-benzenedicarboxylate (H2bdc) or 1,3,5-benzenetricarboxylate (H3btc). Single-crystal X-ray diffraction analyses show that 1 displays a 1-D zigzag chain structure constructed by 1,4-benzenedicarboxylates bridging adjacent Zn(II) ions. Solid 2 shows a 1-D ribbon-like molecular ladder in which three monodentate carboxylates link adjacent Zn1 ions along the crystallographic a-direction and connect Zn1 and Zn2 along the crystallographic c-axis. In the two polymers, all bimt are terminal ligands to complete the metal coordination sphere and help to assemble the low-dimensional coordination skeleton into high-dimensional ordered supramolecular architectures by N–HO or N–HN hydrogen-bonding. IR spectra, fluorescent properties and thermostabilities have been investigated.