Abstract
The FT-IR spectra of polycrystalline dl-serine [α-amino-β-hydroxypropionic acid; HO-CH2-CH(NH3)+-COO-] and isotopically substituted [ND/ODAlcohol (<10% and >90% D); CD2 (>98% D)] dl-serine were recorded in the range 4000-500 cm-1 in the temperature range 300-10 K, and fully assigned. The isotopic-doping/low-temperature methodology, which allows for decoupling of individual proton vibrational modes from the crystal bulk vibrations, was used to estimate the energies of the different H-bonds present in dl-serine crystal. To this end, the frequency shifts observed in both the NH/OH stretching and out-of-plane bending spectral regions (relatively to reference values for these vibrations in non-hydrogen-bonded dl-serine molecules) were used, together with previously developed empirical correlations. The results are compared with available structural data on this amino acid.
Original language | English |
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Pages (from-to) | 73-82 |
Number of pages | 10 |
Journal | Vibrational Spectroscopy |
Volume | 41 |
Issue number | 1 |
DOIs | |
State | Published - 30 May 2006 |
Keywords
- dl-serine
- H-bonding
- Isotopic dilution
- Low-temperature IR spectra