Lee, Matthew Colin JohnSmith, Derek W.2010-07-012010-07-012009Lee, M.C.J. & Smith, D.W. (2009). Correlations between MO eigenvectors and enthalpies of formation for simple organic substances. Thermochimica Acta, 495(1-2), 14-21.https://hdl.handle.net/10289/4071Bondingness, originally used in a qualitative analysis of the barrier to rotation in ethane, has been used to model ΔfH° (g) for simple organic substances. The model is parameterised with a set of 345 molecules including alkanes, alkenes, alkynes, alcohols, ethers, aldehydes, ketones, carboxylic acids, esters, alkenoates, amines, amides, diazenes, nitriles, nitroalkanes, nitrates, thiols and benzenoids. The model is compared with a current empirical scheme as well as a comparison of variations of the model using different simple steric potentials. Using bondingness and the most approximate quantum chemical models a model can be formulated that is comparable with empirical group methods but requiring less parameters.enenthalpy of formationadditivitysemiempiricalAb initioMOsJournal Article10.1016/j.tca.2009.05.011