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

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....

Full description

Saved in:
Bibliographic Details
Published in:Journal of magnetic resonance (1997) 1998-07, Vol.133 (1), p.92-97
Main Authors: Natterer, J., Schedletzky, O., Barkemeyer, J., Bargon, J., Glaser, S.J.
Format: Article
Language:English
Subjects:
catalysis
coherence transfer functions
density operator theory
parahydrogen
PASADENA
PHIP effect
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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. The key aspect of these experiments is the evolution of zero-quantum coherence which is contained in the parahydrogen density operator. Analytical coherence transfer functions have been derived which describe the evolution of this zero-quantum coherence in spin systems consisting of three spins 1/2 that form an AA′X spin system. The analytical expressions presented form a basis for a thorough investigation of crucial catalytic steps.
ISSN:1090-7807
1096-0856
DOI:10.1006/jmre.1998.1421