Solution chemistry standard enthalpies

The standard enthalpies of formation of the acetylacetonate complexes of Al, Ga, Cr111 and Mnm have been determined by solution reaction calorimetry40-43 and the enthalpies of combustion of the Al, Ga and In tris(chelates) reported.44 Such data are relatively scarce in inorganic chemistry and quite valuable. For example, from solution calorimetric hydrolysis experiments on (MeCOCHC-OMe)2Pt, the Pt—O bond energy was found to be 183.1 kJ mol-1.45... 

In some cases experimental values of A,//°and AA are available, but in general these data are calculated using experimental or estimated values of the standard enthalpies of formation, AfH°, and entropies, S°, of all species involved in the reaction. It should also be pointed out that most organometallic reactions of interest occur in solution at temperatures not far from ambient, and that under these conditions the enthalpy term in Equation (6) is often dominant. Therefore, thermodynamic stability trends of organometallic compounds can frequently be analyzed solely in terms of A H°. When necessary, however, computational chemistry calculations or simple estimation schemes can normally be used to predict A, ° with an acceptable accuracy. " ... 

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