Mass spectrometry and IR-spectroscopic study of the gaseous products of thermolysis double complex compounds containing the cation [Cr(urеа) 6] 3+

The gaseous products of thermal decomposition of the double complex compounds with the composition [Cr(urea) 6][Fe(CO) 3]x3H 2O (1), [Cr(urea) 6][Fe(CN) 6]x2H 2O (2), [Cr(urea) 6] 4[Fe(CP) 6] 3x18H 2O (3) and [Cr(urea) 6][Co(NО 2) 6] (4) have been studied in the atmosphere of air and the inert atmospheres of nitrogen and argon. The methods employed were mass- and infrared spectroscopy, chemical and gas analyses combined with thermal analysis. It has been shown that the decomposition nature of urea entering into the composition of complexes 1-3 is similar to that of free urea; namely, the main gaseous products are isocyanic acid and ammonia, while a significant part of coordinated urea is sublimated. The gaseous products have also been found to contain the NH2 radical, water, carbon dioxide, CO, NO, N 2O, and hydrogen cyanide (for compounds 2 and 3). Much of coordinated urea has been sublimated. Complex 4 behaves almost identically during thermolysis regardless of the atmosphere nature, as it decomposes due to the intrasphere redox reaction occurring between urea and nitrite ions with the emission of CO2, CO, NO, NH 3 and H 2O.