✦ LIBER ✦

Intermolecular Zero-Quantum Coherences of Multi-component Spin Systems in Solution NMR

✍ Scribed by Sangdoo Ahn; Natalia Lisitza; Warren S. Warren

Publisher: Elsevier Science
Year: 1998
Tongue: English
Weight: 179 KB
Volume: 133
Category: Article
ISSN: 1090-7807
DOI: 10.1006/jmre.1998.1461

No coin nor oath required. For personal study only.

✦ Synopsis

Intermolecular zero-quantum coherences (iZQC) induced by the dipolar demagnetizing field can give both P-and N-type cross peaks. This paper shows that the relative intensities of the two types of iZQC peaks follow a simple relation, tan 2 (/2), from both the quantum (spin density matrix) and classical (modified Bloch equation) calculations. The experimental data and numerical simulations agree well with the prediction. In addition, higher-order iZQCs are experimentally examined for the first time and are explained by the quantum picture in which dipolar couplings convert four-spin operators into observable magnetization.

📜 SIMILAR VOLUMES

Detection of Intermolecular Heteronuclea

Detection of Intermolecular Heteronuclear Multiple-Quantum Coherences in Solution NMR

✍ Patricia R. Bachiller; Sangdoo Ahn; Warren S. Warren 📂 Article 📅 1996 🏛 Elsevier Science 🌐 English ⚖ 139 KB

assuming that the sample begins at equilibrium. I and S are Over the past few years, we and others have shown that, the two different kinds of spins ( 1 H and 13 C in our experiin a wide variety of two-dimensional solution NMR experiments, respectively), and the indices i and j run up to the ments,

Quantum Treatment of Intermolecular Mult

Quantum Treatment of Intermolecular Multiple-Quantum Coherences with IntramolecularJCoupling in Solution NMR

✍ Sangdoo Ahn; Warren S. Warren; Sanghyuk Lee 📂 Article 📅 1997 🏛 Elsevier Science 🌐 English ⚖ 340 KB

## A recently introduced density matrix picture for dipolar effects Alternatively, it is possible to write a density matrix treatin solution NMR (1996, J. Chem. Phys. 105, 874) gave complete ment which explicitly shows the origin of the cross peaks solutions for intermolecular multiple-quantum coh

Experimental Characterization of Intermo

Experimental Characterization of Intermolecular Multiple-Quantum Coherence Pumping Efficiency in Solution NMR

✍ Huiming Zhang; Natalia Lizitsa; Robert G. Bryant; Warren S. Warren 📂 Article 📅 2001 🏛 Elsevier Science 🌐 English ⚖ 113 KB

The behavior of intermolecular multiple-quantum coherences in a variety of simple liquids with different chemical and magnetic properties is investigated experimentally and modeled by numerical simulations based on modified Bloch equations. The effects of spin concentration, temperature, intramolecu

Investigating Catalytic Processes with P

Investigating Catalytic Processes with Parahydrogen: Evolution of Zero-Quantum Coherence in AA′X Spin Systems

✍ J. Natterer; O. Schedletzky; J. Barkemeyer; J. Bargon; S.J. Glaser 📂 Article 📅 1998 🏛 Elsevier Science 🌐 English ⚖ 172 KB

A systematic outline for the elucidation of the nature of hydrogenation intermediates with a lifetime too short to be directly detectable with standard NMR methods is presented. The method takes advantage of the special nature of the parahydrogen density operator and its inherent enhancement factor.