title: Simple and accurate determination of X-H distances under ultra-fast MAS NMR.
abstract: We demonstrate that a very simple experiment, Cross-Polarization with Variable Contact-time (CP-VC), is very efficient at ultra-fast MAS (νR ≥ 60 kHz) to measure accurately the C-H and N-H distances, and to analyze the dynamics of bio-molecules. This experiment can be performed with samples that are either (13)C or (15)N labeled or without any labeling. The method is very robust experimentally with respect to imperfect Hartman-Hahn setting, and presents a large scaling factor allowing a better dipolar determination, especially for long C-H or N-H distances, or for CH3 or NH3 moieties with three-site hopping. At ultra-fast MAS, it can be used quantitatively in a 2D way, because its scaling factor is then little dependent on the offsets. This robustness with respect to offset is related to the ultra-fast spinning speed, and hence to the related small rotor diameter. Indeed, these two specifications lead to efficient n = ±1 zero-quantum Hartman-Hahn CP-transfers with large RF-fields on proton and carbon or nitrogen channels, and large dipolar scaling factor.
authors.affiliation: Polish Academy of Sciences, Centre of Molecular and Macromolecular Studies, Sienkiewicza 112, PL-90-363 Lodz, Poland.
authors.forename: Piotr
authors.initials: P
authors.lastname: Paluch
authors.forename: Tomasz
authors.initials: T
authors.lastname: Pawlak
authors.forename: Jean-Paul
authors.initials: JP
authors.lastname: Amoureux
authors.forename: Marek J
authors.initials: MJ
authors.lastname: Potrzebowski
mesh_terms: D000465:Algorithms; D002244:Carbon; D004867:Equipment Design; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular / Q000379:methods*; D011522:Protons
chemical_list: D011522:Protons; D002244:Carbon
keywords: Cross-Polarization; C–H and N–H distances; Ultra-fast MAS