The vibrational structure of (E,E')-1,4-diphenyl-1,3-butadiene Linear dichroism FT-IR spectroscopy and quantum chemical calculations.
The title compound (DPB) was investigated by FT-IR spectroscopy in liquid solutions and by FT-IR linear dichroism (LD) measurements on samples aligned in stretched polyethylene. The LD data provided experimental assignments of molecular transition moment directions and vibrational symmetries for more than 40 vibrational transitions. The observed IR wavenumbers, relative intensities, and polarization directions were generally well reproduced by the results of a harmonic analysis based on B3LYP/cc-pVTZ density functional theory (DFT). The combined experimental and theoretical results led to proposal of a nearly complete assignment of the IR active fundamentals of DPB, involving reassignment of a number of transitions. In addition, previously published Raman spectra of DPB were well predicted by the B3LYP/cc-pVTZ calculations.
Department of Life Sciences & Chemistry, Roskilde University, P.O. Box 260, DK-4000 Roskilde, Denmark.
Bjarke K V
BK
Hansen
Søren
S
Møller
Jens
J
Spanget-Larsen
D002070:Butadienes / Q000737:chemistry*; D011789:Quantum Theory; D017550:Spectroscopy, Fourier Transform Infrared; D014732:Vibration
D002070:Butadienes; C012939:1,4-diphenylbutadiene