The interaction of the potentially binucleating enaminoketone, ligand 3,11-diacetyl-2,12-dioxo-5,9-diazatrideca-3,11-diene, towards nickel(II), cobalt(II) and copper(II) ions yields square planar complexes. The interaction of the complexes with ammonia, 1,2-diaminopropane, hydroxylamine and copper(II) acetylacetonate has been investigated. The complexes have been characterized by elemental analyses, UV-vis and IR spectroscopy, molar conductances, mass spectra, 1H NMR, D.T.A., magnetic and ESR measurements. The molar conductances in DMF indicate that the complexes are non-ionic. Exposing nickel(II) complex (2) in CD3OD/D2O (10%) to 60Co γ-rays at 77 K using a 0.2216 M rad h−1 dose, yields a nickel(I), d9 species with a ground state. The spectrum shows that annealing above 77 K leads to a low-spin, nickel(III), d7 species with a ground state. The cobalt(II) complex (3) shows a spectrum with g ⊥ > g ‖, indicating a ground state; however, the copper(II) complex (4) shows a spectrum with g ‖ > g ⊥, indicating a ground state. The redox properties of the copper(II) complexes (4 and 13) are discussed.
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El-Tabl et al. (2004) studied this question.
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