Preparation, structural characterisation, thermal and electrical studies of the chloro complexes of cobalt, nickel and copper with acrylamide

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The chloro compounds of cobalt, nickel and copper with acrylamide have been prepared. Spectral and magnetic data have been used to deduce the stereochemistry of the compounds. The thermal behaviour of acrylamide and its complexes with cobalt, nickel and copper have been studied by thermogravimetry and differential thermal analysis. The cobalt complex forms an intermediate complex before the metal oxide is produced. The nickel and copper complexes undergo decomposition with loss of the organic ligand and chlorine to give the metal oxides. Electrical conductivities for the compounds at room-temperature are in the range 5.8 × 10 −8 Ω −1 m −1 (for the cobalt compound) to 3.1 × 10 −5 Ω −1 m −1 (for the copper compound). The current-voltage characteristic for the uncomplexed acrylamide is ohmic whereas its complexes exhibit hysteresis which is attributed to orientation of the polar complexed molecules in the applied electric field. The temperature dependences of conductivity have been determined for the compounds and are used to measure the activation energies for conduction.