Abstract
Combination of CdCl2 and 1-ethylimidazole (EtIm) with different molar ratios affords three cadmium(II) complexes, i.e., [Cd2(EtIm)4(μ2-Cl)2Cl2] (1), [Cd(EtIm)3Cl2] (2) and [Cd(EtIm)4Cl2] (3). Single-crystal X-ray diffraction analysis reveals the Cl-bridged dinuclear two Cd(II) center ions in 1 have different coordination geometries, that is, one is a cis-pseudo-octahedral (N4Cl2) and the other a pseudo-tetrahedral (Cl4) while the mononuclear Cd(II) center ion adopts a trigonal bipyramidal geometry (N3Cl2) in 2 and a trans-octahedral geometry (N4Cl2) in 3, respectively. Dielectric studies show 1 and 2 undergo dielectric transitions below room temperature and a typical dielectric relaxation behavior is shown in 1, which are caused by the order–disorder transitions of terminal ethyl groups of the EtIm ligands in the crystals.
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