MOLECULAR ELECTROSTATIC POTENTIAL OF SUBSTITUTED AROMATIC-COMPOUNDS - FACTORS AFFECTING THE DIFFERENCES BETWEEN ABINITIO AND SEMIEMPIRICAL RESULTS

The molecular electrostatic potential (MEP) distribution of anisole, chlorobenzene, and fluorobenzene obtained from STO-3G, 3-21G, and 6-31G* basis set ab initio and MNDO and AM1 semiempirical wave functions is investigated to explain the differences among the MEP features obtained for polychlorodibenzo-p-dioxins. The main topological features as well as the absolute and relative minima location obtained from ab initio calculations are independent from the choice of the basis set. MNDO calculations are in good agreement with the ab initio ones in the case of anisole and fluorobenzene, while they incorrectly describe the MEP of chlorobenzene. The AM1 fails to localize the absolute minimum of fluorobenzene and does not find the minimum above the chlorobenzene chlorine atom. The poor agreement of both semiempirical methods with ab initio for any kind of chlorinated compounds is confirmed by results obtained for chloroethylene and chloroethane. We hypothesize that the main problem concerning these methods is that they freeze a too large amount of electrons in the atomic core of elements belonging to the second row, which makes for a wrong description of the core-valence electron interactions. Results obtained by modifying the AM1 parameters related to these interactions confirm our hypothesis.