کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9575372 | 1504343 | 2005 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Far-infrared spectra of amino acids
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The far-infrared absorption of polycrystalline samples of 18 amino acids has been measured in the spectral range from 10 to 650 cmâ1. The assignment of the observed bands is based on comparing the spectra of different amino acids and normal modes calculations present in literature. The absorption peaks can be grouped in five regions that are characteristic for all the specimens. In the region 480-650 cmâ1 COOâ rocking/wagging/bending modes are observed. NH3+ torsion is dominant in the range 380-480 cmâ1. Between 270 and 380 cmâ1 the CCαN deformation mode dominates, followed by a region between 220 and 270 cmâ1 specific for COOâ vibrations. Below 220 cmâ1 a one-to-one correspondence of absorption frequencies to certain modes (COOâ torsion, NCαC deformation, NH3+ torsion, and omnipresent H bonds) is no more possible.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Physics - Volume 316, Issues 1â3, 19 September 2005, Pages 61-71
Journal: Chemical Physics - Volume 316, Issues 1â3, 19 September 2005, Pages 61-71
نویسندگان
Adriana Matei, Natalia Drichko, Bruno Gompf, Martin Dressel,