Аннотация
A complete experimental study on the vibrational properties of palmitic
and stearic acids crystallized in the B-m and C forms, both belonging to
the monoclinic system with the P2(1)/a (C-2h(5)) space group, through
polarized Raman and infrared spectroscopy, is reported in this paper.
Density functional theory calculations were also performed to assign the
normal modes and to help in the interpretation of the experimental data.
The different polarizations were compared and their influence on the
spectral profiles, in both the lattice and the internal mode regions,
was discussed. In general, the Raman and infrared spectra exhibit
accentuated differences among the polymorphic forms, which are
associated with the different molecular modifications, defined as gauche
and all-trans conformations. Insights about interaction among different
groups are also furnished.
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