Abstract
The complex formation reactions of several d-metal acetates with decamethyl-substituted biladiene-a,c (H2L) in pyridine (Py) have been studied by electronic spectroscopy. The coordination of H2L by zinc(II) and copper(II) affords mononuclear complexes [ML], and the coordination by cadmium(II) and mercury(II) produces binuclear heteroligand complexes [M2L(AcO)2], whereas the coordination by cobalt(II) gives binuclear biligand complexes [M2L2]. In a Py solution in the presence of a copper acetate excess, the ligand in the [CuL] complex is oxidized at the methylene spacer. The thermodynamic formation constants of the mono- and binuclear chelates have been determined from spectral data. The peculiarities of complex formation in pyridine and in dimethylformamide (DMF) are analyzed in comparison.
Published Version
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