Abstract
Abstract The enthalpy changes (ΔH) in the reaction of trans-[CoX2(AA)2]X·mHX·nH2O-type complexes with an alkaline sodium sulfide solution were calorimetrically measured at 25 °C, where AA is diamine and X is Cl−, Br−, or ClO4−; m=0 or 1, and n=0, 0.5, 1, or 2. The thermal stabilities were found to decrease in the following orders for both dichloro and dibromo complexes: 1,2-ethanediamine>l- or d-1,2-propanediamine>racemic 1,2-propanediamine,d,l-2,3-butanediamine>meso-2,3-butanediamine>2-methyl-1,2-propanediamine, 1,2-ethanediamine>1,3-propanediamine, and meso-2,4-pentanediamine>d,l-2,4-pentanediamine. The complexes containing six-membered diamine chelate rings were less stable than those containing five-membered diamine chelate rings. The dibromo complex bromides were less stable than the corresponding dichloro complex chlorides.
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