Ab Initio calculations of the stabilization energies of the conformational and the structural isomers of C3H7X where X = F, Cl, and Br

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Abstract
HF, MP2, and B3LYP calculations with different basis sets have been used in the computation of the stabilization energies of C3H7X isomers, where X is F, Cl, and Br. The experimental stabilization energies of the structural isomers of C3H7Cl and C3H7Br have been reproduced via B3LYP calculations. However, the calculated stabilization energies of fluoropropane isomers from their reported enthalpies of formation have been reproduced in all methods of calculations in present work. The experimental relative stabilities of the gauche conformers of 1-fluoro-, 1-chloro-, and 1-bromopropanes have been also reproduced via some of the used calculations in the present work. The effect of the geminal interactions on X atomic charges and on the C–X and C–C bond lengths in halopropane isomers are also discussed. © 2002 Wiley Periodicals, Inc. J Comput Chem 23: 966–976, 2002

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