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

Abstract

The two compounds Cr 2 (2-TPY) 4 (HO) 2 1 and Cr(2-TPY) 2 (H 2 O)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 (e) measurements of powder and single-crystal samples were performed. The e of single-crystal sample is twice the e of powder sample. However, the dielectric loss value (tan δ ) of the crystal is relatively small and only half of the tan δ of powder sample. These characteristics were attributed to the higher density level and ordered arrangement of the crystal lattice.