Magnetic Property, Heat Capacity and Crystal Structure of Mononuclear Compounds Based on Substitute Tetrazole Ligand

Three mononuclear compounds formulated as {M[(2-1H-tetrazol-5-yl)pyridine](2)(H(2)O)(2)} (M = Fe(II) (1), Co(II) (2), Cu(II) (3)) were reported and synthesized. Their space group is monoclinic, P2(1)/c, revealed by single-crystal X-ray diffraction. Antiferromagnetic interactions exist in Compounds 1, 2 and 3, as evidenced by magnetic and low-temperature heat capacity measurements. In addition, their thermodynamic functions were determined by a relaxation calorimeter, indicating that Compound 1 exhibits a Schottky anomaly in low-temperature heat capacity. This work can provide an important fundamental basis for the research of the thermophysical properties of molecular-based magnetic materials.