کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1409001 | 1501708 | 2016 | 8 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: A comparative study of the vibrational spectra of the anticancer drug melphalan and its fundamental molecules 3-phenylpropionic acid and l-phenylalanine A comparative study of the vibrational spectra of the anticancer drug melphalan and its fundamental molecules 3-phenylpropionic acid and l-phenylalanine](/preview/png/1409001.png)
• The structures of Melphalan, 3-phenylpropionic acid and l-phenylalanine were optimized at the DFT B3LYP level.
• The vibrational wavenumbers were calculated.
• Vibrational assignments were provided by combining experimental and theoretical data.
The structural stability and the vibrational spectra of the anticancer drug melphalan and its parent compounds 3-phenylpropionic acid and l-phenylalanine were investigated by the DFT B3LYP/6-311G** calculations. Melphalan and its fundamental compounds were predicted to exist predominantly in non-planar structures. The vibrational frequencies of the low energy structures of melphalan, 3-phenylpropionic acid, and phenylalanine were computed at the DFT B3LYP level of theory. Complete vibrational assignments of the normal modes of melphalan, 3-phenylpropionic acid, and phenylalanine were provided by combined theoretical and experimental data of the molecules. The experimental infrared spectra of phenylalanine and melphalan show a significantly different pattern of the CO stretching mode as compared to those of normal carboxylic acids. A comparison of the 3700–2000 cm−1 infrared spectral region of the three molecules suggests the presence of similar intermolecular H-bonding in their condensed phases. The observed infrared and Raman spectra are consistent with the presence of one predominant melphalan conformation at room temperature.
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Journal: Journal of Molecular Structure - Volume 1109, 5 April 2016, Pages 171–178