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Density functional theory modeling and calculation of NMR parameters: An ab initio study of the polymorphs of bulk glycine

机译:密度泛函理论建模和NMR参数计算:从头算研究大体积甘氨酸的多晶型

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摘要

The three forms of glycine in the solid state, α, β, and γ, are described and modeled by means of generalized-gradient approximation (GGA) ab initio calculations. In particular, the location of the protons in each structure is studied. The vibrational frequencies and the NMR chemical shifts of ~1H, ~(13)C, and ~(15)N in the three polymorphs are calculated and compared to experimental data (IR and Raman, solid-state magic angle spinning NMR, respectively). ~(13)C chemical shift differences on the order of 1 ppm, which constitute the most accurate way to discriminate between the three structures when X-ray diffraction is not available, can be satisfactorily predicted.
机译:通过广义梯度近似(GGA)从头算起,描述并建模了固态的三种形式的甘氨酸,α,β和γ。特别是,研究了每个结构中质子的位置。计算了三种多晶型物的振动频率和〜1H,〜(13)C和〜(15)N的NMR化学位移,并将其与实验数据(分别为IR和拉曼,固态幻角旋转NMR)进行了比较。可以令人满意地预测到〜(13)C化学位移差异约为1 ppm,这是在没有X射线衍射时区分三个结构的最准确方法。

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