New reactions for the metal oxinates

The oxine adduct of Th(IV) oxinate and divalent copper, zinc, and cobalt oxinates reacted with trichloroacetic acid to produce mixed ligand complexes in which the oxinate is bidentate in the Th(IV) and Cu(II) complexes and monodentate, coordinated as a zwitterion through its phenolate oxygen, in the Zn(II) and Co(II) complexes. The reaction of Co(II) oxinate with picric acid or 2,4 dinitrophenol resulted in the formation of a charge transfer type of complexes in which the ratio of the cobalt oxinate to nitrophenol is 2:1. Analytical and spectral evidence are in accordance with the suggested structures. (author)