... 978-3-642-66176-1 DOI: 10.1007/978-3-642-66,176-1 Library of Congress
Cataloging in Publication Data: Rummens, Frans H A 1933 – Van der Waals
forces in NMR intermolecular shielding effects. (NMR basic principles and
Author: Frans H.A. Rummens
Publisher: Springer Science & Business Media
The usefulness of solvent effect studies on NMR chemical shifts need not be elabo rated here; many applications of solvent effects continue to be published in great profusion. Quite a few intermolecular phenomenae may contribute to solvent shifts, but there is always the ubiquitous Van der Waals effect ow. Contrary to such other effects as neighbour anisotropy 0a, reaction field contribution 0E or complexation effects 0e, no major direct use has yet been found for the Van der Waals effect. So far the role of the Van der Waals effect has been that of a nasty, disturbing phenom enon, something to be eliminated at all costs. But it is precisely in this latter respect where almost all solvent effect studies fall short. Not only is Ow usually large (larger than 0a and 0E even in 1 H NMR and probably the dominating term with heavier nuclei), but it is strongly variable from one solute to another and even from one nu clear site to another in the same solute molecule. No referencing technique, however cleverly devised, will be capable of eliminating the Ow contribution from the other, presumedly more interesting contributions. It appeared quite recently that mathematical trickery by the name of "factor analysis" could achieve the sought-for separation of contribuants.
The series ' N.M.R. , Basic Principles and Progress ' has proved to be prolific with
books on ' Van der Waals Forces and Shielding Effects ' , by F. H. A. Rummens , ' '
High Resolution N.M.R. Spectroscopy in Solids ' , by M. Mehring , ' Chlorine ...
Publisher: Royal Society of Chemistry
Reflecting the growing volume of published work in this field, researchers will find this book an invaluable source of information on current methods and applications.
Li and Chestnut ( 1985 ) have presented evidence that correlate shielding y -
effects with attractive van der Waals forces and not repulsive steric interactions ,
though their results still suggest that the gauche arrangement of the observed ...
Author: Alan E. Tonelli
Describes both high resolution solution and solid state techniques; presents applications to synthetic and biological polymers; demonstrates the connection between microstructures, conformations, and NMR spectra of polymers. Annotation copyrighted by Book News, Inc., Portland, OR
Author: Library of Congress. Copyright Office
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