Summary
Disubstituted phenylazo-barbituric and thiobarbituric acid complexes derived from CoII, NiII and CuII salts have been prepared. Electronic spectra and magnetic susceptibility measurements prove that the cobalt and nickel complexes have high-spin octahedral and square planar configurations, respectively. The copper-barbituric complexes have distorted octahedral geometry with a possible Cu−Cu interaction, whereas the corresponding thiobarbiturate complexes have square pyramidal distorted octahedral and tetragonal geometries. The room temperature e.s.r. spectra of the copper complexes show anisotropy with axial symmetry in tetragonal geometry,\(d_{x^2 - y^2 } \) ground state as a result of Cu−Cu interaction. This dimeric structure disappears in DMSO solution. The intradimer super-exchange interaction is temperature dependent indicating a change of the geometry. In some complexes, the azo group coordinates to the metal, in others it does not. The denticity of the ligands has been determined.
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Masoud, M.S., El-Dessouky, M.A., Aly, F.A. et al. Transition metal (disubstituted phenylazo)-barbituric and thiobarbituric acid complexes. Transition Met Chem 15, 443–448 (1990). https://doi.org/10.1007/BF01040773
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DOI: https://doi.org/10.1007/BF01040773