Summary
New complexes of the general formulae [M(LH2)2Cl2] (M = Mn, Fe, Co, Ni, Cu, Zn), [Mn(LH2)2X2] (X = Br, I), [Cu(LH2)2Br2], [Ni(LH2)2X2] (X = Br, NCS, ONO2), [Cu(LH2)X2]n (X = Cl, Br), K2[NiL2]·2H2O and K2-[CuL2]·H2O, where LH2 = malonamide, were isolated. The complexes were characterized by elemental analyses, X-ray powder patterns, magnetic susceptibilities and spectroscopic (variable-temperature 57Fe-Mössbauer, e.s.r., u.v.-vis., i.r., far-i.r., Raman) studies. Monomeric trans pseudo-octahedral stereochemistries for the neutral 1∶2 complexes and square planar structures of D 2h symmetry for the two ionic complexes are assigned in the solid state. Dimeric or polymeric five-coordinate structures are proposed for the 1∶1 copper(II) compounds. LH2 and L2− behave as bidentate chelating ligands binding through oxygen and deprotonated nitrogen atoms, respectively. A detailed comparison of the studied complexes with the corresponding oxamide complexes is also presented.
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De Beukeleer, S., Desseyn, H.O., Perlepes, S.P. et al. Transition metal complexes with neutral and deprotonated malonamide. Transition Met Chem 19, 468–476 (1994). https://doi.org/10.1007/BF00139331
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DOI: https://doi.org/10.1007/BF00139331