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

Abstract

Two coordination polymers, {[Zn(bdc)(bimt)₂]H₂O}_n (1) and {[Zn_1.5(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.

Keywords:

• 2-((Benzoimidazol-yl)methyl)-1H-tetrazole
• Crystal structure
• Fluorescent property
• Thermostability

Acknowledgment

We gratefully acknowledge the financial support by the National Natural Science Foundation of China (No. J0830412).