Abstract
Abstract The title ligand, which contains two 8-quinolinol (oxine) functions in one molecule, and the Ni(II) and Cu(II) chelates have been synthesized and characterized. Visible and ultraviolet spectra of the chelates and the ligand in several solvents have been measured. Square-coordination of the ligand to the metal has been revealed by a comparison of the d-d bands between the chelates and quadridentate Schiff base chelates in the literature. Intraligand transition bands of the title chelates and the solvent effects on the frequency shifts have been compared with those of the ligand, 8-hydroxy-1-methylquinolinium hydroxide, bis(8-quinolinolato)palladium(II), -copper(II), and -nickel(II), and have been discussed.
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