Preparation and properties of yttrium, lanthanum and lanthanide o-nitrobenzoates

The conditions of the formation of yttrium, lanthanum and lanthanide o-nitrobenzoates were studied and their quantitative composition and solubilities in water at 298 K were determined (their solubilities are of the order of 10-2 moldm-3). The IR and X-ray spectra for the obtained complexes and the dehydrated rare earth element o-nitrobenzoates were recorded; all prepared complexes are crystalline compounds. The conditions of thermal decomposition of the complexes were also studied. It was found that on heating above 523 K the complexes decompose explosively and undergo a melting process at the same time. Therefore the thermal decomposition for complexes being studied was carried out in the temperature range 273-523 K. From the results it appears that during the dehydration process or with the increase of temperature no transformation of the nitro group to nitrito occurs. (Author)