Crystal structures and luminescence properties of a one-dimensional cadmium coordination polymer derived from a flexible bis(imidazole) ligand

A new Cd(II) coordination polymer, namely [Cd(pbmb)(mip)]n (pbmb = 1,1′-(1,3-propane)bis-(2-methylbenzimidazole), H2mip = 5-methylisophthalic acid), is hydrothermally synthesized and characterized by elemental analyses, infrared spectroscopy and single crystal X-ray diffraction analyses. It crystallizes in the triclinic space group P1¯\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$P\overline 1 $$\end{document}, a = 0.2883(11), b = 11.3409(12), c = 13.2519(14) Å, α = 69.6950(10)°, β = 73.5850(10)°, γ = 63.8100(10)°, V = 1285.8(2) Å3, Z = 2, C28H28CdN4O5, Mr = 612.94, Dc = = 1.583 g/cm3, μ = 0.896 mm–1. In the complex, adjacent dinuclear units [Cd2(pbmb)2] are bridged by mip2– ligands in the μ2-η2, η1 coordination modes to construct 1D ladder-like chains which are additionally assembled into a 2D supramolecular network via C–H∙∙∙π interactions. Moreover, the luminescence properties of the complex are described.