LIGAND BEHAVIOR AND REACTIVITY OF PHENYL 2-PYRIDYL KETONE AZINE - STRUCTURES OF 2 POLYMORPHIC FORMS OF THE AZINE AND A COPPER COMPLEX OF THE 3-PHENYLTRIAZOLO[1,5-A]PYRIDINE

Two polymorphic forms of phenyl 2-pyridyl ketone azine (L-1) and the c omplex [(ZnLCl2)-Cl-1] have been synthesized and characterized by X-ra y diffraction analysis. In the reaction with copper(II) chloride both isomers of the azine undergo hydrolytic and oxidative processes, givin g rise to the complex [(CuL2Cl2)-Cl-2] (L-2 = 3-phenyltriazolo[1,5-a]- pyridine). In order to clarify this process, phenyl 2-pyridyl hydrazon e (L-3) has been synthesized and treated with copper(II) chloride; in this way CuL2(Cl). H2O and (CuLCl2)-Cl-3 were isolated.