Dg. Mitnik et Am. Lucero, Application of density functional theory concepts to the study of the chemical reactivity of isomeric thiadiazolines, J MOL ST-TH, 535, 2001, pp. 39-47
Several useful concepts derived from density functional theory have been ap
plied to the study of the chemical reactivity of the more stable forms of t
he isomeric thiadiazolines. Dipole moments, total hardness of the molecules
in terms of the calculated ionization potentials and electron affinities a
s a measure of aromaticity and the condensed Fukui functions related to the
variation of the net charges of the atoms resulting from a Mulliken popula
tion analysis were calculated in order to determine the reactivity of diffe
rent sites within the molecules studied. The net charges have been obtained
from calculations made in the context of the Hartree-Fock and of local (SV
WN) and nonlocal (BLYP, B3LYP) density functional approximations. The resul
ts were compared with the existing experimental evidence on thiadiazolines
and related compounds. Electronic properties calculated using the hybrid B3
LYP proved to be the most accurate. It is concluded that the 1,2,3-thiadiaz
oline molecule would be the best starting monomer of the four isomers to be
considered for a polymerization reaction. (C) 2001 Elsevier Science B.V. A
ll rights reserved.