Abstract
The enthalpy changes for the reaction of [Co(AA) 3]X 3 and [Co(dien) 2]X 3 type complexes with an alkaline sodium sulfide solution were calorimetrically measured at 25°C, where AA is the diamine such as en, pn, tn, bpy or phen and X is Cl, Br, NO 3, I or ClO 4. The thermal stabilities were found to decrease in the following orders: chloride > bromide > nitrate > iodide > perchlorate; aliphatic diamine > aromatic diamine complexes; five-membered chelate > six-membered chelate compounds; and tris(diamine) > bis(triamine) complexes.
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