title: A cryosolution infrared study of the complexes of fluoroform with ammonia and pyridine: Evidence for a C-H...N pseudo blue-shifting hydrogen bond.
abstract: Mid-infrared spectra of mixed solutions in liquid xenon containing fluoroform and either ammonia or pyridine have been investigated at temperatures between 173 and 213 K. For both Lewis bases, a new band is found in the CH stretching region at a frequency approximately 5 cm(-1) higher than that of monomer fluoroform, which is assigned to a complex between fluoroform and the Lewis base. A detailed analysis of the nu1/2nu(4) Fermi resonance in the proton donor shows that the blue shifts observed for the complexes are not caused by a strengthening of the CH bond during the complexation, but are due to the changes in the Fermi resonance interactions. Information on the nu1/2nu(4) Fermi resonance was also obtained for the complexes of fluoroform with dimethyl ether and trimethyl amine.
authors.affiliation: Department of Chemistry, University of Antwerp, Groenenborgerlaan 171, B-2020, Antwerp, Belgium.
authors.forename: Wouter A
authors.initials: WA
authors.lastname: Herrebout
authors.forename: Sonia M
authors.initials: SM
authors.lastname: Melikova
authors.forename: Sofie N
authors.initials: SN
authors.lastname: Delanoye
authors.forename: Konstantin S
authors.initials: KS
authors.lastname: Rutkowski
authors.forename: Dimitri N
authors.initials: DN
authors.lastname: Shchepkin
authors.forename: Benjamin J
authors.initials: BJ
authors.lastname: van der Veken
mesh_terms: D000641:Ammonia / Q000737:chemistry*; D002244:Carbon / Q000737:chemistry*; D005617:Chlorofluorocarbons, Methane / Q000737:chemistry*; D003116:Color; D006859:Hydrogen / Q000737:chemistry*; D006860:Hydrogen Bonding; D008738:Methyl Ethers / Q000737:chemistry; D009584:Nitrogen / Q000737:chemistry*; D011725:Pyridines / Q000737:chemistry*; D012996:Solutions; D013059:Spectrum Analysis, Raman; D014732:Vibration
chemical_list: D005617:Chlorofluorocarbons, Methane; D008738:Methyl Ethers; D011725:Pyridines; D012996:Solutions; D002244:Carbon; D000641:Ammonia; D006859:Hydrogen; C033413:dimethyl ether; D009584:Nitrogen; C023666:pyridine; C009554:fluoroform