The heat of formation of tris(acetylacetonato)manganese(III) and the manganese–oxygen bond energy
- 1 January 1968
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc. A
- p. 3116-3118
- https://doi.org/10.1039/j19680003116
Abstract
The standard heat of formation of tris(acetylacetonato)manganese (III) has been determined at 25° by reaction calorimetry: ΔH°fMn(C5H7O2)3(c)=–332·1 ± 0·7 kcal./mole. Enthalpy changes for the following hypothetical gaseous reactions at 25° have been derived: Mn3+(g)+ 3C5H7O2–(g)= Mn(C5H7O2)3(g)(ΔHf.i.=–1475 kcal./mole) and Mn(g)+ 3C5H7O2(g)= Mn(C5H7O2)(g)(ΔHf.r.=–263 kcal./mole). The heterolytic (E′) and homolytic (E″) manganese–oxygen bond-energy parameters are E′Mn–O= 246 kcal./mole and E′Mn–O= 44 kcal./mole. The homolytic bond energy appears to provide the better basis for the comparison of MIII–O bond energies in the first transition-series metal acetylacetonates.Keywords
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