Synthesis, structure and dielectric properties of the first 1D Ba-tetrazole complex [Ba(4-TPA)2(H2O)4·3.5(H2O)]n

The first 1D Ba(II)-tetrazole coordination polymer, [Ba(4-TPA)2(H2O)4·3.5(H2O)]n (1), which is constructed by a [BaO2]n inorganic skeleton chain with organic 4-TPA wings on both sides, has been synthesized and characterized by single crystal X-ray crystallography and temperature dependence dielectric constant (ε) measurement, (4-TPA = 2-(4-(1H-tetrazol-5-yl)pyridinium-1-yl) acetate). The ε of single crystal sample is almost twice the ε of powder sample. However, the dielectric loss of the crystal is relatively smaller, which is attributed to the highly ordered arrangement in crystal lattice.