title: Hydrogen bond effects in the vibrational spectra of 1,3-propanediol in acetonitrile: ab initio and experimental study.
abstract: Hydrogen bond interactions strongly affect vibrational properties and frequencies, the most common consequence being a redshift of the stretching vibration involved; there are, however, few exceptions to this general trend. In previous works, we have proved the effectiveness of ab initio simulations combined with wavelet analysis to investigate these effects and put them into relation to structural environment. In this work, we investigate the hydrogen bond effects on the structural and vibrational properties of 1,3-propanediol in acetonitrile by a combined experimental and computational approach. We explain the appearance of two spectral components in the O-H stretching band on the basis of intra- and intermolecular hydrogen bond interactions. We also elucidate the blueshift of the C≡N stretching band as due to a hydrogen bond interaction between the glycol and acetonitrile that modify the electron density distribution inside the CN group. This effect is well reproduced by ab initio molecular dynamics simulations and density functional calculations reported in this work.
authors.affiliation: European Laboratory for Nonlinear Spectroscopy, Via Nello Carrara 1, 50019 Sesto Fiorentino, Italy.
authors.forename: Francesco
authors.initials: F
authors.lastname: Muniz-Miranda
authors.forename: Marco
authors.initials: M
authors.lastname: Pagliai
authors.forename: Gianni
authors.initials: G
authors.lastname: Cardini
authors.forename: Roberto
authors.initials: R
authors.lastname: Righini
mesh_terms: D000097:Acetonitriles / Q000737:chemistry*; D006860:Hydrogen Bonding; D008968:Molecular Conformation; D056004:Molecular Dynamics Simulation; D011409:Propylene Glycols / Q000737:chemistry*; D011789:Quantum Theory; D013057:Spectrum Analysis; D014732:Vibration
chemical_list: D000097:Acetonitriles; D011409:Propylene Glycols; C041787:1,3-propanediol; C032159:acetonitrile