Electrostatic Constraints Assessed by ¹H MAS NMR Illuminate Differences in Crystalline Polymorphs.

ABSTRACT: Atomically resolved crystal structures not only suffer from the inherent uncertainty in accurately locating H atoms but also are incapable of fully revealing the underlying forces enabling the formation of final structures. Therefore, the development and application of novel techniques to illuminate intermolecular forces in crystalline solids are highly relevant to understand the role of hydrogen atoms in structure adoption. Novel developments in ¹H NMR MAS methodology can now achieve robust measurements of ¹H chemical shift anisotropy (CSA) tensors which are highly sensitive to electrostatics. Herein, we use ¹H CSA tensors, measured by MAS experiments and characterized using DFT calculations, to reveal the structure-driving factors between the two polymorp

SUBMITTER: Damron JT 

PROVIDER: S-EPMC6295661 | biostudies-literature | 2017 Sep

REPOSITORIES: biostudies-literature