Abstract
The thermal behaviour of Ru 3(CO) 12 and Os 3(CO) 12 have been investigated by thermogravimetry, in argon, nitrogen and air dynamic atmosphere and by DTA and DSC in argon. Meaningful differences were observed between the two complexes: while Ru 3(CO) 12 in argon and nitrogen atmosphere decomposes to metallic ruthenium and carbon monoxide, Os 3(CO) 12 sublimates completely before decomposition and a condensation of the vapour was observed on the cold wall of the quartz furnace tube of the TG apparatus. Both the complexes ignite in air dynamic atmosphere but only Ru 3(CO) 12 shows a residue at the end of the experiment. The melting heats and entropies, the decomposition heats were evaluated and found to be for Ru 3(CO) 12: 10.40 kcal mol −1, 24.03 cal deg −1 mol −1, 89.45 kcal mol −1 and for Os 3(CO) 12: 10.70 kcal mol −1, 21.37 cal deg −1 mol −1, 70.5 kcal mol −1
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