Summary
The new complexes K2[ML2]·2H2O (M=Ni, Cu), K2[PdL2]·H2O, K2[CuL2(H2O)2]·H2O, [Ni(LH2)Cl2]x ·xH2O and [Ni(LH2)Br2]x·1,5xH2O, where LH2= oxalyldihydrazide, have been prepared. Emphasis has been put on determining the conditions for the synthesis of both deprotonated and non-deprotonated NiII complexes. They were characterized by analyses, conductivity measurements, thermogravimetry, magnetic susceptibility and spectroscopic methods like i.r. and far-i.r., diffuse reflectance u.v. vis, and e.s.r. Monomeric square planar and distorted octahedral structures were found for the deprotonated complexes in the solid state while the non-deprotonated NiII complexes appeared to be pseudo-tetrahedral polymers. The doubly deprotonated L2-ion exhibits a bidentate N(amide), N(amide)-coordination, while the neutral LH2 molecule behaves as a N(amino), N(amino)-bidentate ligand forming polymeric structures. Vibrational analysis of the complexes was carried out, using hydrogen and metal isotopic substitution.
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Perlepes, S.P., Quaeyhaegens, F.J. & Desseyn, H.O. Synthesis, spectroscopy and thermal properties of the nickel(II), palladium(II) and copper(II) complexes of oxalyldihydrazide. Transition Met Chem 15, 132–140 (1990). https://doi.org/10.1007/BF01023902
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DOI: https://doi.org/10.1007/BF01023902