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The reaction products of five 2‐hydroxyaryloximes with Ni(II), Pd(II), and Co(II) have been obtained and characterized by elemental analyses, conductometric measurements, magnetic moment determination, and spectroscopic methods (IR, 1H NMR, electronic absorption in solutions and in solid state). Cyclic voltammetry on mercury and carbon fibre electrodes has been employed to investigate the electrochemical behaviour in DMF solutions. The effect of substituents on the structure of the chelates and the electron distribution is assessed, discussed and compared with the behaviour of the corresponding copper(II) chelates. The structure of the title compound trans‐bis(propanone, 1‐[2‐hydroxyphenyl]‐oximato) nickel(II), Ni(C9H10NO2)2 was determined by X‐ray diffraction monoclinic system (space group P21/n), a = 11.894, b = 5.126, c = 13.668 Å, b̃ = 103.72°, Z = 2. The structure was refined by full‐matrix least squares to a conventional R = 0.03. Ni is on the equatorial plane and surrounded by two nitrogen and two oxygen at distances 1.884(3) Å and 1.825(2) Å, respectively.

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C18H20N2NÌO4, triclinic, P\ (No. 2), a = 6.296(5) Â, b = 8.204(7) À, c = 8.653(8) Â, α = 71.92(6)°, β = 80.61(7)°, γ= 83.84(6)°, V=418.4À 3 ,Z= 1, pm= 1.536 g-crrT 3 , Rg{F) = 0.045, RV/(F 1 ) = 0.115, 7=293 K.

The reaction products of five substituted 2-hydmxyaryloximes with Fe(III) ion were obtained and characterized by means of elemental analysis, conductometric measurements, magnetic moment determinations and spectroscopic data (IR and electronic absorption).The thermal stability and mode of decomposition were studied in air atmosphere by using TG-DTA. Kinetic analysis of the TG data was performed with the Coats-Redfern method to determine the apparent activation energies and the pre-exponential factor of the Arrhenius equation. Mass spectrometry was also used, and possible fragmentation patterns are given and discussed.