Arsenic bond dissociation energies

Thermochemical measurements have been made on a number of arsenic compounds. The heats of formation of trimethyl- and triphenylarsine have been used to calculate the mean dissociation energy of the As—C bonds in these compounds. The values found, 51.5 kcal/mole for the methyl compound and 60.3 kcal/mole for the other, are significantly different (506,507). 

O Hare, P.A.G. (1993) Calorimetric measurements of the specific energies of reaction of arsenic and of selenium with fluorine. Standard molar enthalpies of formation Af7/°m at the temperature 2.98.15 K of AsFs, SeF6, As2Se3, AS4S4, and As2S3. Thermodynamic properties of AsFs and SeF6 in the ideal-gas state. Critical assessment of AfH°m (AsF3, 1)), and the dissociation enthalpies of As-F bonds. Journal of Chemical Thermodynamics, 25, 391-402. 

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