Inorganic Chemistvypentoxide) were unsuccessful. A saturated solution of the complex was treated with an equimolar amount of the gaseous diacid chloride (phosgene) or a solution of the diacid chloride in dry acetone. The solid product was isolated by pouring the reaction mixture into water, followed by washing with water and organic solvents to remove impurities. The elemental analysis and infrared spectra of the products obtained indicated slight polymerization and partial decomposition of the chelate.Infrared Absorption Spectra.--All infrared spectra were obtained using a Perkin-Elmer Model 21 infrared spectrophotometer with sodium chloride optics. Samples were prepared as potassium bromide disks or heaachlorobutadiene mulls.T o avoid absorption of water, mulls of the azomethine derivatives were prepared in a drybox, after drying the sample at l l O o , tn uacuo.Thermal Stability Measurements.-Measurements were performed under nitrogen or argon using a simple therrnogravimetric balance similar to that described by U'insloiv and Matreyek. *E The accuracy of the apparatus was checked using reagent grade CuS04.5H20 as a standard. The weight losses observed a t two different temperatures (123 and 270') with a 200-rng. sample of (25) F . H. Winslow and W. Matreyek, J . Polymer Sci., 22, 315 (1956) CuS04.5HzO heated under nitrogen for consecutive 12-hr. pcriods agree to within 2YG of the expected values a t these temperatures. 26 The weight loss after 12 hr. a t 150" was usually slight and presumed to be due to loss of water. The thermal stability data are reported in Tables IV and 1 ' as per cent weight loss a t the designated temperature relative to the sample weight at l SO", after heating for 12 hr. a t that temperature. Temperatures were constant to within *5' and the weight of sample used was approximately 200 mg., except as noted. The reliability of these data has been checked in two cases by duplicate determinations which agree to within 554, of the given value for weight losses greater than 4yc.

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