𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Spin Dynamics of Polarization Inversion Spin Exchange at the Magic Angle in Multiple Spin Systems

✍ Scribed by Zhehong Gan

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
132 KB
Volume
143
Category
Article
ISSN
1090-7807

No coin nor oath required. For personal study only.

✦ Synopsis

Polarization inversion spin exchange at the magic angle (PISEMA) [J. Magn. Reson. A 109, 270 (1994)] is an important experiment in NMR structural characterization of membrane proteins in oriented lipid bilayers. This paper presents a theoretical and experimental study of the spin dynamics in PISEMA to investigate the line-narrowing mechanism. The study focuses on the effect of neighboring protons on the spin exchange of a strongly coupled spin pair. The spin exchange is solved analytically for simple spin systems and is numerically simulated for many-spin systems. The results show that the dipolar couplings from the neighboring protons of a strongly coupled spin pair perturb the spin exchange only in the second order, therefore it has little contribution to the linewidth of PISEMA spectra in comparison to the separated-local-field spectra. The effects from proton resonance offset and the mismatch of the Hartmann-Hahn condition are also discussed along with experimental results using model single-crystal samples.

📜 SIMILAR VOLUMES

Multiple-Quantum Cross Polarization in Q
Multiple-Quantum Cross Polarization in Quadrupolar Spin Systems during Magic-Angle Spinning
✍ David Rovnyak; Marc Baldus; Robert G Griffin 📂 Article 📅 2000 🏛 Elsevier Science 🌐 English ⚖ 104 KB

We describe the concept of multiple-quantum cross polarization (CP) between an I ‫؍‬ 3 2 and an I ‫؍‬ 1 2 spin during magic-angle spinning. Experimental and theoretical results for 23 Na-1 H pairs are presented that elucidate the transfer mechanism and the beneficial effect of adiabatic amplitude mo

The Spin Dynamics of Heteronuclear Multi
The Spin Dynamics of Heteronuclear Multiple-Spin Systems Formulated in the Extended Strong-Narrowing Limit
✍ Leiming Zhu 📂 Article 📅 1996 🏛 Elsevier Science 🌐 English ⚖ 264 KB

Employing the perturbation approach directly in the multiply rowing conditions are very stringent and usually cannot rotating frame, the master equation governing the spin dynamics be satisfied in biopolymer systems, in which NMR plays of scalar-coupled heteronuclear multiple-spin systems has been a

Analysis of cross-polarization dynamics
Analysis of cross-polarization dynamics between 1H and 19F in Viton fluoroelastomer using solid-state 19F magic angle spinning and 1H → 19F cross-polarization magic angle spinning NMR
✍ Shinji Ando; Robin K. Harris; Gustavo A. Monti; Stefan A. Reinsberg 📂 Article 📅 1999 🏛 John Wiley and Sons 🌐 English ⚖ 210 KB 👁 2 views

The cross-polarization dynamics between 1 H and 19 F in a Viton-type fluoroelastomer were studied using 19 F magic angle spinning (MAS) and 1 H ! 19 F cross-polarization (CP)/MAS NMR at 188.29 MHz. The phenomenological theory of spin thermodynamics based on the spin temperature hypothesis was employ

Trimethylstannylboranes—inverse detectio
Trimethylstannylboranes—inverse detection of broad 119Sn NMR signals in solution and solid-state 119Sn cross-polarization magic angle spinning NMR
✍ Bernd Wrackmeyer; Ēriks Kupče; Jörg Kümmerlen 📂 Article 📅 1992 🏛 John Wiley and Sons 🌐 English ⚖ 348 KB

## Abstract Extremely broad ^119^Sn resonances, as the result of ^1^__J__(^119^Sn,^11^B) scalar coupling, were readily detected, even for diluted samples (5 mg in 0.5 ml of C~6~D~6~), via inverse two‐dimensional ^1^H{^119^Sn} NMR experiments. Two bis(amino)trimethylstannylboranes and four dialkylam

15N cross-polarization using the inversi
15N cross-polarization using the inversion–recovery cross-polarization technique and 11B magic angle spinning NMR studies of reference compounds containing B—N bonds
✍ Christel Gervais; Florence Babonneau; Jocelyne Maquet; Christian Bonhomme; Domin 📂 Article 📅 1998 🏛 John Wiley and Sons 🌐 English ⚖ 326 KB 👁 2 views

BoraneÈammonia complexes, trialcynylborazine and N-trimethylcycloborazane were characterized by 15N and 11B solid-state magic angle spinning (MAS) NMR. They are representative of compounds containing BÈN bonds and presenting various N and B environments, either tri-or tetracoordinated. InversionÈrec