Structural, thermal and electrical studies of some transition metal compounds of 2-methylpyrazine

Abstract The preparation and some properties of complexes of 2-methylpyrazine with the chlorides of manganese(II), cobalt(II), nickel(II), copper(II) and zinc(II) are described. Magnetic measurements, and electronic and infrared studies indicate that the compounds have polymeric octahedral structures. The thermal behaviour of these compounds have been studied by thermogravimetry (TG) and differential thermal analysis (DTA). Electrical measurements show that all compounds exhibit ohmic behaviour at room temperature with conductivities in the range 1.68 × 10 −8 Ω −1 m −1 (for the cobalt compound) to 7.36 × 10 −1 Ω −1 m −1 (for the copper compound). The temperature dependences of the conductivity have been determined for the compounds and used to measure the activation energies for conduction.