New metal-chelate complexes derived from the condensation product of biacetylmonoxime andN,N-dimethylglycine hydrazide hydrochloride (Girard's D Reagent)

Abstract

The reactions between the condensation product of biacetylmonoxime andN,N-dimethylglycine hydrazide hydrochloride, [BMGD]Cl, and the hydrated NiII, CuII, CdII, HgII and UVIO2 salts give chelate complexes of types [M(BMGD)Cl2]Cl (M = CdII or HgII), [Cu(BMGD)2Br2]Cl2 and [M(BMGD-H)2(H2O)2]Cl2 · YH2O (M=NiII, CuII or UVIO2). Elemental analyses, magnetic measurements and spectra (i.r., visible, n.m.r.) have been used to characterize the complexes. I.r. spectral data show that the ligand is monodentate, coordiingvia the azomethine group of the hydrazone, or bidentate, coordinating through the azomethine and the carbonyl oxygen groups. The enolization of the carbonyl oxygen involves the NH rather than the CH2 group. The stereochemistry of the NiII and CuII complexes is discussed.