6533b85afe1ef96bd12b9f6f
RESEARCH PRODUCT
Anomalous temperature dependence of the IR spectrum of polyalanine
Jussi TimonenRaimo A. LohikoskiJouko Korppi-tommolaS. KotilaJanne NieminenVesa M. Heleniussubject
AlaninePhysics::Biological PhysicsQuantitative Biology::BiomoleculesSidebandChemistryExcitonGeneral Physics and AstronomyInfrared spectroscopy02 engineering and technology021001 nanoscience & nanotechnology01 natural sciencesMolecular physics3. Good healthchemistry.chemical_compoundNuclear magnetic resonanceLattice (order)0103 physical sciencesFermi resonancePhysical and Theoretical Chemistry010306 general physics0210 nano-technologyElectronic band structureAcetanilidedescription
Abstract We have studied the temperature dependence of the infrared spectra of acetanilide (ACN), tryptophan–(alanine) 15 , and tyrosine–(alanine) 15 . No sidebands of the amide-I vibration were observed in the polypeptides, but two anomalous sidebands of the NH stretch with a similar temperature dependence as that of the anomalous amide-I vibrational mode at 1650 cm −1 of crystalline ACN were detected. Fermi resonance combined with the appearance of a red-shifted sideband of NH stretch through coupling to lattice modes seems to explain this band structure. Observations are indicative of excitons that may occur in polypeptides as well as in single crystals of ACN.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1997-12-01 | Chemical Physics Letters |