Syntheses, structures, and properties of two novel cadmium coordination polymers with 1D and 2D structures

Two novel complexes [Cd2(MIP)2(BDC)2]n (1) [MIP = 2-(3-methoxyphenyl)-1H-imidazo[4,5-f][1,10]phenanthroline, BDC = terephthalic acid] and [Cd(IPM)(NDC)]n (2) [IPM = 4-(1H-imidazo[4,5-f][1,10]phenanthrolin-2-yl)-2-methoxyphenol, NDC = naphthalene-1,4-dicarboxylic acid] have been synthesized by hydrothermal reaction and characterized by elemental analysis, IR, single-crystal X-ray diffraction and thermogravimetric analysis (TGA). Complex 1 exhibits 1D zigzag chain structure and complex 2 shows 2D layer topology. The intermolecular CH⋯O interactions extend the complex 1 into 2D networks, and the existing H-bonds further stabilized the complexes 1–2, which can be proved by TGA experiment. Furthermore, the solid-state fluorescence spectrum of the complex 2 was studied, as well as the ligand IPM. The complex 2 exhibits intense broad emission at 540 nm at room temperature, which is red-shifted by 45 nm relative to that of free ligand IPM.

► We synthesized two novel Cd(II) complexes by hydrothermal reaction.
► The hydrogen bonding interactions play key roles in supramolecular structures.
► We studied the solid-state fluorescence of complex 2, as well as the ligands.