Fig. 1. Hexamer conformation of poly(N-vinylimidazole) from MM calculations by
using UFF force field.
Fig. 2. The possible dimer conformations for poly(NVIM).
Table 1
Total energy and Gibbs free energy of the dimer conformations (Hartrees), DE and DG
with respect to the most stable conformer (kcal/mol), populations (%), and molecular
volumes (bohr3/mol) at B3LYP/6-31G(d) level.
Conformer E DE G DG Ni (%) V
Dimer 1 608.231736 0.00 608.287153 0.00 74.23 1858.2
Dimer 2 608.231702 0.02 608.286153 0.63 25.75 1835.2
Dimer 3 608.226957 2.98 608.279411 4.23 0.02 1638.5
scaling factor of 0.9806 was applied [29]. The assignments of
the vibrational modes have been made on the basis of the internal
coordinate analysis implemented in Gaussian03. For the most of
the modes in Table 3, scaled harmonic frequencies differ from
experimental values by 0–10 cm1.