Effect of optimised hybridization displacement charge on the description of molecular electrostatic potentials of some substituted acetaldehydes

Abstract

Molecular electrostatic potential (MEP) maps of acetaldehyde, fluoroacetaldehyde, trifluoroacetaldehyde, hydroxyacetaldehydeand aminoacetaldehyde were studied using ab initio SCF wavefunctions with 6-31G** basis set as well as a recently developed and optimised new method in which a combination of L6wdin and hybridization displacement charges (HDC) at the MNDO level is used. An important point of this method is the distribution of electronic charges continuously and spherically in three dimensions, which helps reproduce most of the important features of the corresponding ab initio MEP maps that cannot be achieved using point charges. Electrophilic reactivity of the molecules has been discussed using the MEP results.