کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1251063 | 970884 | 2007 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Infrared and Raman spectroscopic characterization of the hydrogen-bonding network in l-serine crystal
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موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The IR spectra (4000-400 cmâ1) of neat and isotopically substituted (ND/OD â¤Â 10% D and â
30% D) polycrystalline l-serine (α-amino-β-hydroxypropionic acid; HO-CH2-CH(NH3)+-COOâ) were recorded in the temperature range 300-10 K and assigned. The isotopic-doping/low-temperature methodology, which allows for decoupling of individual proton vibrational modes from the crystal bulk vibrations, was used for estimating the lengths and energies of the different H-bonds present in l-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 l-serine molecules) were used, together with previously developed empirical correlations between these spectral parameters and the H-bond properties. In addition, the room-temperature Raman spectrum (4000-150 cmâ1) of a single crystal of neat l-serine was also recorded and interpreted. A systematic comparison was made between the spectroscopic data obtained currently for l-serine and previously for dl-serine, revealing that the vibrational spectra of the two crystals reflect well the different characteristics of their hydrogen-bond networks, and also correlate accurately with the different susceptibility of the two crystals to pressure-induced strain.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Vibrational Spectroscopy - Volume 43, Issue 2, 11 March 2007, Pages 395-404
Journal: Vibrational Spectroscopy - Volume 43, Issue 2, 11 March 2007, Pages 395-404
نویسندگان
S. Jarmelo, I. Reva, P.R. Carey, R. Fausto,