M. R. D. Silva, G. Pilcher, R. Irving
1988
Citations
0
Influential Citations
12
Citations
Journal
The Journal of Chemical Thermodynamics
Abstract
Abstract The standard ( p o = 101.325 kPa) molar enthalpies of formation of the following crystalline pentane-2,4-dionate complexes were determined by solution-reaction calorimetry. Using enthalpies of sublimation (literature values or estimates), the mean molar bond-dissociation enthalpies were derived based on an estimated D (OH) in the enol form of pentane-2,4-dione, Hpd, of (400 ± 20) kJ·mol −1 . Δ f H m o {m(pd) 2 , cr } 〈D〉( m-O ) Δ f H m o {m(pd) 2 , cr } 〈D〉( m-O ) Metal kJ·mol −1 kJ·mol −1 Metal kJ·mol −1 kJ·mol −1 Be −1236.4 ± 2.3 265 ± 10 Ba −1332.9 ± 3.1 232 ± 10 Mg −1263.2 ± 2.2 221 ± 10 Zn −961.8 ± 3.0 139 ± 10 Ca −1348.9 ± 2.4 246 ± 10 Cd −903.1 ± 2.4 119 ± 10 Sr −1344.9 ± 3.1 236 ± 10 Hg −723.9 ± 2.7 62 ± 10 The 〈 D 〉(m-O) values correlate well with the mean molar dissociation enthalpies of the corresponding solid oxides: mO(cr) = m(g) + O(g).