N,N′-Bis(phenylaminomethyl)parabanic add as a complexing agent. Complexes of some bivalent first row transition metals

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Abstract
The preparation of some complexes of N,N′-bis(phenylaminomethyl)parabanic acid with halides of cobalt(II), nickel(II), and copper(II) is reported. The complexes of the type MLX2 seem to have pseudo-tetrahedral and pseudo-octahedral symmetry. The complexes have been studied by means of magnetic susceptibility measurements, infrared and far infrared spectra, electronic and nmr spectra, and conductivity measurements. The ligand behaves as bidentate N-bonded. The various ligand field parameters, Dq, B', and β have been evaluated. The B' values suggest a strong covalency in the metal–ligand σ bond and Dq values show a medium strong ligand field. The presence of metal–nitrogen bonds is suggested. The possible stereochemistries of the complexes are discussed in the light of the experimental results.

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