Preparation and properties of yttrium, lanthanum, and lanthanide 3,5-dinitrobenzoates

Abstract

The condition of the formation of rare earth 3,5-dinitrobenzoates were studied and their quantitative composition and solubilities in water at 298 K determined (their solubilities are of the order of 10−4 mol dm−3). From the values of solubilities in water the solubility products were established (in the order of 10−12 mol4 dm−12). The IR and X-ray spectra for the hydrated and dehydrated complexes were recorded and studied. All complexes are crystalline compounds. The condition of thermal decomposition of the complexes was also investigated. On heating above 573 K the 3,5-dinitrobenzoates decompose explosively and undergo a melting process at the same time. Accordingly, the thermal decomposition for the complexes was studied in the temperature range 273–573 K. The thermal stability data reveal them to dehydrate in two steps. From the obtained results it appears that during the dehydration process no izomerization of the nitro group to the nitrito group occurs.