کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1403889 | 1501820 | 2011 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
From the X-rays to a reliable “low cost” computational structure of caffeic acid: DFT, MP2, HF and integrated molecular dynamics-X-ray diffraction approach to condensed phases
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
To reach this goal, we applied a low cost approach - in terms of computational time and resources - aimed at the achievement of a high resolution, robust and trustable structure using the X-ray single crystal data, recollected with a higher resolution, as touchstone for a detailed check. A comparison between the calculations carried out with density functional theory (DFT), Hartree-Fock (HF) method and post SCF second order Møller-Plesset perturbation method (MP2), at the 6-31G** level of the theory, molecular mechanics (MM) and molecular dynamics (MD) was performed. As a consequence we explained on one hand the possible reasons for the pitfalls of the DFT approach and on the other the benefits of using a good and robust force field developed for condensed phases, as AMBER, with MM and MD. The reliability of the latter, highlighted by the overall agreement extended up to the anisotropic displacement parameters calculated by means of MD and the ones gathered by X-ray measurements, makes it very promising for the above-mentioned goals.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Molecular Structure - Volume 994, Issues 1â3, 17 May 2011, Pages 87-96
Journal: Journal of Molecular Structure - Volume 994, Issues 1â3, 17 May 2011, Pages 87-96
نویسندگان
Giuseppe M. Lombardo, Gustavo Portalone, Marcello Colapietro, Antonio Rescifina, Francesco Punzo,