The structure of the nickel—8-quinolinol complex in some organic solvents

The ultraviolet and visible absorption spectra of the nickel—8-quinolinol complex in chloroform are significantly affected by traces of water. Absorption spectra of the complex in mixed solvents, e.g. dioxane—water, dioxane—methanol and chloroform-methanol, and in chloroform solution containing water, pyridine, or 8-quinolinol are compared. An addition compound is formed in which the mole ratio of the nickel-8-quinolinol complex to the solvent or the base is 1:1 or 1:2. Polymerization occurs by mutual interaction between the nickel-8-quinolinol complexes. A degree of polymerization of 2.2 was obtained; this indicates that the binuclear compound predominates. The structure of the nickel—8-quinolinol complex in organic solvents is discussed.