Synthesis, structure and dielectric properties of two Cr(III)-tetrazole complexes Cr2(2-TPY)4(HO)2 and Cr(2-TPY)2(H2O)Cl

The two compounds Cr2(2-TPY)4(HO)2 1 and Cr(2-TPY)2(H2O)Cl 2 have been synthesized and characterized by single-crystal X-ray crystallography, elemental analysis and IR, (2-TPY = 2-(1 H-tetrazol-5-yl)pyridine). Moreover, their temperature-dependence dielectric constant (ε) measurements of powder and single-crystal samples were performed. The ε of single-crystal sample is twice the ε of powder sample. However, the dielectric loss value (tanδ) of the crystal is relatively small and only half of the tanδ of powder sample. These characteristics were attributed to the higher density level and ordered arrangement of the crystal lattice.