title: IR, Raman and SERS spectra of propantheline bromide.
abstract: The two known propantheline bromide polymorphs (form I and form II) were studied and characterized by a multianalytical approach. In the present work, the identification of propantheline bromide polymorphic forms through vibrational IR spectroscopies are presented and for the first time Raman microscopy and hot stage Raman microscopy (HSRM) studies are reported. Finally, quantum mechanical calculations were performed. For assisting the assignment of the experimental picks, the two IR spectra of the most and least stable representatives of a set of 56 conformers are calculated and studied. DSC thermograms data, are also reported. The surface enhanced Raman scattering (SERS) spectrum was also recorded in a silver colloid; it could be inferred that propantheline bromide is adsorbed on silver colloid through the oxygen atom with the molecular plane perpendicular to the metal surface.
authors.affiliation: Department of Pharmaceutical Sciences, Institute of Pharmacy, University of Modena and Reggio Emilia, via Campi n. 183, 41100 Modena, Italy.
authors.forename: C
authors.initials: C
authors.lastname: Baraldi
authors.forename: G
authors.initials: G
authors.lastname: Freguglia
authors.forename: A
authors.initials: A
authors.lastname: Tinti
authors.forename: M
authors.initials: M
authors.lastname: Sparta
authors.forename: A N
authors.initials: AN
authors.lastname: Alexandrova
authors.forename: M C
authors.initials: MC
authors.lastname: Gamberini
mesh_terms: D000897:Anti-Ulcer Agents / Q000737:chemistry*; D003460:Crystallization; D008958:Models, Molecular; D011413:Propantheline / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013059:Spectrum Analysis, Raman / Q000379:methods
chemical_list: D000897:Anti-Ulcer Agents; D011413:Propantheline