Although several investigations
have been concerned with the properties of S-quinolinol (oxine) chelates, little interest has been shown in the hydrated chelates themselves.
The thermal stabilities of a number of chelate hydrates have been summarized by HOLLISGSHEAI~ 1, but these arc, at best, to be considered no more than procedural decomposition temperatures. CI~~I~LES cl a1.2-4 reported the thermal stability and volati.lity of some di-and trivalent metal chelates of 8-quinolinol, but did not deal with the hydrates. The thermal dissociation of chelates containing an estra molecule of the chelating agent as a solvate have been estensively investigated by WENDLANDT et al.e-8. Thermal studies pertaining specifically to the hydrates were made by UORREL AND PARIS" on the copper, magnesium, zinc and nickel chelates of z-methyloxine (z-methyl-S-quinolinol) ; these, however, were limited to correlation of structure with the procedural deco~lposition temperature.
The purpose of the present investigation is to present data on the thermal dehydration of the hydrated Y-quinolinol chelates of Cu(II), Ni(If), Co(II), Cd(II), Zn(II), Mn(II) and M&II). Data presented arc the heats of dehydration, kinetics of dehydration, and high temperature rcflcctance spectra of the hydrated and anhydrous compounds.
R. H. CORE, W. W.