A novel 2D double helix cadmium(II) coordination polymer: synthesis, crystal structures and luminescence properties

A novel double helix coordination polymer, [Cd(2,2′-bpeec)I2]n (1) (2,2′-bpeec=3,6-bis[2-(2-pyridyl)ethenyl]-9-ethylcarbazole) has been prepared and characterized by elemental analyses, IR and luminescence spectra, single crystal X-ray diffraction. Complex 1 crystallizes in the space group P21/c with a=8.444(2), b=23.126(4), c=14.156(2), β=97.927(2), Z=4, V=2737.8(7) Å3, μ=3.073 mm−1. The 2D framework of the title compound is formed by C-H⋯I hydrogen bonds and π-π interactions. The solid-state fluorescent analyses show that the compound exhibits a broad emission band at 547 nm.