The heat of formation (DeltaH(f)) of sulfine, CH2=S=O, has been determined
by the CBS-QB3 quantum chemical method, using 10 reactions, including the i
sodesmic reaction CH2=S=O + SO2 --> CH2 = S + SO3. The derived DeltaH(f) of
sulfine, -30 +/- 6 kJ/mol at 298 K, lies midway between two previously cal
culated values: -9 +/- 14 and -52 +/- 10 kJ/mol. The CBS-QB3 derived DeltaH
(f) (0 K) was very recently validated against the very accurate Weirmann-1
' (W1 ') method [L.N. Heydorn, et al., Z. Phys. Chem. 215(2001) 141] and th
ere is excellent agreement between the two methods, within 3 kJ/mol. Our re
commended value is evaluated against experimental observables, such as the
measured proton affinity of CH2=S=O and the appearance energy of CH2=S+-OH
from dimethyl sulfoxide ions, CH3S(=O)CH3.+. (C) 2001 Elsevier Science B.V.
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