A large number of quantum mechanical studies have been
devoted to study the structural and electronic properties of conducting
oligomers and polymers derived from thiophene and pyrrole
[16–20]. These investigations have been extremely useful not
only to rationalize the experimental observations but also to
develop the comprehensive design of new conducting materials
by using the knowledge provided by such calculations. In the last
decade some theoretical studies have been devoted to study oligoanilines
and/or PAn using ab initio and/or density functional theory
(DFT) methods [20]. To the best our knowledge, there have been no
reports in the literature about the DFT study on water-soluble
poly(NVIM).
In this study, we present density functional calculation of the
geometrical and vibrational properties of the ground state of
water-soluble poly(NVIM) and its dimeric forms. The theoretical
data (molecular parameters, FTIR and Raman spectra) are compared
to the results of the experimental studies performed in the
solid state. Natural bond orbitals (NBO) charges were performed
at the same level of theory. Most stable dimeric forms were analyzed
according to their hydrogen bonding energy and geometric
characterization. Besides, 1H NMR and 13C NMR spectra of poly
(NVIM) have been recorded and discussed. Thermal properties of
poly(NVIM) were investigated by using TGA, DTA and DSC.