SPECTROSCOPIC AND THERMOCHEMICAL INVESTIGATION OF ALKALINE-EARTH METAL-SALTS OF 2-OXIMINOPROPIONATE

Alkaline earth metal 2-oximinopropionates were prepared by the reactio n of sodium 2-oximinopropionate with the respective metal nitrates or chlorides in water at room temperature. These compounds were character ized by infrared and multinuclear NMR spectroscopy and thermogravimetr ic analysis. The thermal decomposition of the salts occurs in the rang e 144-188 degrees C and exhibits a trend towards lower temperature wit h increasing size of the cation. In all cases, the decomposition yield s a metal carbonate. The molecular structure of calcium 2-oximinopropi onate hydrate was determined by single-crystal X-ray crystallography. Crystal data: C6H10N2O7Ca, MW = 262.24g/mol, triclinic, space group P (1) over bar (No.2), a = 8.954(1) Angstrom, b = 9.3851(7) Angstrom, c = 6.2445(7) Angstrom, alpha = 97.209(8)degrees, beta = 104.917(9)degre es, gamma = 87.250(8)degrees, V = 503.0(2) Angstrom(3), Z = 2, D-calc = 1.73 g cm(-3)R = 0.03 and R-w = 0.04.