Radio-frequency driven polarization transfer without heteronuclear decoupling in rotating solids
نویسندگان
چکیده
This Letter reports significant excitation of C homonuclear double-quantum coherence in a solid-state magic-angle-spinning NMR experiment, acquired without heteronuclear decoupling of abundant H spins. The heteronuclear decoupling efficiency of a group of existing homonuclear polarization transfer sequences are investigated and optimal schemes are identified. Since the approach permits the application of fast MAS and significantly reduces the total radio-frequency power used, it is particularly well suited to biomolecular applications at ultra-high magnetic fields. 2004 Elsevier B.V. All rights reserved.
منابع مشابه
Symmetry principles for the design of radiofrequency pulse sequences in the nuclear magnetic resonance of rotating solids
Some new symmetry theorems are presented which simplify the task of designing multiple-pulse radio-frequency pulse sequences in magic-angle-spinning solid-state NMR. The symmetry theorems apply to sequences denoted R N, which n consists of N repetitions of a pulse sequence element R, alternating in phase between the values "pnrN. Each R element ideally rotates the spins by an angle p about the ...
متن کاملDipolar Determinations in Solids by Relaxation-Assisted NMR Recoupling
The determination of internuclear I-S distances and geometries in solids from dipolar coupling measurements constitutes one of the most important capabilities of NMR.1 These determinations are usually complicated by the simultaneous presence of largersbut structurally uninterestingsinteractions such as the anisotropic chemical shift. Dipolar contributions to a total powder NMR line shape can be...
متن کاملFivefold symmetric homonuclear dipolar recoupling in rotating solids: Application to double quantum spectroscopy
We describe a new fivefold symmetric approach to homonuclear recoupling in rotating solids that is based on rotor-synchronized, spin-lock rf irradiation of the type employed previously in MELODRAMA and C7 ~and their derivative sequences! for C– C recoupling. The fivefold sequence, like its sevenfold relatives, is g-encoded, and therefore exhibits a theoretical efficiency of ;73% for double quan...
متن کاملSimulating spin dynamics in organic solids under heteronuclear decoupling.
Although considerable progress has been made in simulating the dynamics of multiple coupled nuclear spins, predicting the evolution of nuclear magnetisation in the presence of radio-frequency decoupling remains challenging. We use exact numerical simulations of the spin dynamics under simultaneous magic-angle spinning and RF decoupling to determine the extent to which numerical simulations can ...
متن کاملRationalising Heteronuclear Decoupling in Refocussing Applications of Solid‐State NMR Spectroscopy
Factors affecting the performance of 1 H heteronuclear decoupling sequences for magic-angle spinning (MAS) NMR spectroscopy of organic solids are explored, as observed by time constants for the decay of nuclear magnetisation under a spin-echo (T2' ). By using a common protocol over a wide range of experimental conditions, including very high magnetic fields and very high radio-frequency (RF) nu...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2004