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} (M = Fe (), Co (), Cu ()) were reported and synthesized. Their space group is monoclinic, 2/c, revealed by single-crystal X-ray diffraction. Antiferromagnetic interactions exist in Compounds , and , as evidenced by magnetic and low-temperature heat capacity measurements. In addition, their thermodynamic functions were determined by a relaxation calorimeter, indicating that Compound 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.