title: Long-distance inter-hydrogen bond coupling effects in the polarized IR spectra of succinic acid crystals.
abstract: The spectral properties of four different crystalline succinic acid (HOOC-(CH2)2-COOH) (SAC) isotopomer systems, h6, d2, d4 and d6, were examined by means of the IR spectroscopy in polarized light aided by numerical simulations of the νO-H and νO-D band contour shapes on utilizing the "strong-coupling" model. The abnormal IR spectral properties of SAC crystals in relation to the corresponding properties of glutaric, pimelic and adipic acid crystals were ascribed to the hyperconjugation electronic effects in the acid associated molecules. A vibronic coupling mechanism involving the proton stretching vibrations in the (COOH)2 cycles and the electronic motions in the molecular skeletons, the isotopic "H/D self-organization" mechanisms and a long-distance vibrational exciton coupling between the adjacent (COOH)2 cycles in the molecular chains are mainly responsible for the generation of the temperature effects in the crystalline IR spectra.
authors.affiliation: Institute of Chemistry, University of Silesia, 9 Szkolna Street, Pl-40-006 Katowice, Poland. Electronic address: flakus@ich.us.edu.pl.
authors.forename: Henryk T
authors.initials: HT
authors.lastname: Flakus
authors.affiliation: Institute of Chemistry, University of Silesia, 9 Szkolna Street, Pl-40-006 Katowice, Poland. Electronic address: barbara.hachula@us.edu.pl.
authors.forename: Barbara
authors.initials: B
authors.lastname: Hachuła
authors.affiliation: Institute of Chemistry, University of Silesia, 9 Szkolna Street, Pl-40-006 Katowice, Poland.
authors.forename: Jakub T
authors.initials: JT
authors.lastname: Hołaj-Krzak
mesh_terms: D003460:Crystallization; D006860:Hydrogen Bonding; D008958:Models, Molecular; D013055:Spectrophotometry, Infrared / Q000379:methods; D019802:Succinic Acid / Q000737:chemistry*; D013696:Temperature
chemical_list: D019802:Succinic Acid
keywords: Dynamical co-operative interactions; Hydrogen bond; Isotopic dilution; Polarized IR spectra; Temperature effects