Metal Chelates of Some β,δ-Triketone Homologues. Copper(II) Chelates of 2,6-Diacetyl-4-methylphenol, 2,2′-Dihydroxybenzophenone, 2-Acetoacetylphenol and 2-Acetyl-1,8 -dihydroxynaphthalene

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Abstract
Copper(II) chelates of 2,6-diacetyl-4-methylphenol, 2,2′-dihydroxybenzophenone, 2-acetoacetylphenol and 2-acetyl-1,8-dihydroxynaphthalene were synthesized. The first and last ligands give only a mononuclear chelate of type CuL2 respectively, whereas the second and third ones give a binuclear complex of type Cu2L2 in addition to the mononuclear complex. In the cases of the latter ligands two types of complexes are interconvertible and in a solution phase there exists an equilibrium between them. Higher temperature favors a binuclear form and lower temperature another form. Structures of the complexes are assigned with spectroscopic and thermogravimetric data.
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