Different dynamics of chiral and racemic (L- and DL-) serine crystals: Evidenced by incoherent inelastic neutron and Raman scattering
Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
Interest in chiral versus racemic amino acid forms stems from their different solid-state properties associated to the packing arrangement that leads to starkly different physical behavior. Here we focus on the different dynamic properties of the chiral (l-form) and racemic (dl-form) crystals of serine, (C3H7NO3). Measuring incoherent inelastic neutron and Raman scattering over a wide temperature range we could assess a subtle dynamical transition in l-serine near 150 K. The difference in the dynamic properties of the crystals of l- and dl-serine evidenced from our spectroscopic studies is in a good agreement with the different CP(T) dependences and different structuralstrain of the two forms on cooling. Despite a higher bulk density, the molecular fragments in the crystals of l-serine are more dynamic than in dl-serine, and this manifests itself in the incoherent inelastic neutron and Raman spectra, as well as in a higher heat capacity, a higher thermal expansion coefficient, or in the NMR-spectra.
Originalsprog | Engelsk |
---|---|
Tidsskrift | Journal of the American Chemical Society |
Vol/bind | 129 |
Udgave nummer | 36 |
Sider (fra-til) | 10984-10985 |
Antal sider | 2 |
ISSN | 0002-7863 |
DOI | |
Status | Udgivet - 12 sep. 2007 |
Eksternt udgivet | Ja |
ID: 204464458