Original scientific paper

The Determination of Paramagnetic Susceptibilities by High-resolution Nuclear Magnetic Resonance

K. D. Bartle ; School of Chemistry, University of Bradford, Bradford 7, England
D. W. Jones ; School of Chemistry, University of Bradford, Bradford 7, England
S. Maričić ; Institute of Biology, The University, Zagreb, Yugoslavia

Abstract

Existing high-resolution NMR techniques for th e determinat ion
of the magnetic susceptibilities of paramagne tic materials in solu tion
are reviewed critically and the underlying theory is discussed.
Attempts t o measure th e effect of interaction between indicator
protons and para m agnetic ions suggest that, in the cases examined,
this is less imp orta nt than the change in field or frequency con sequent on the insertion of paramagnetic material in the probe of
a field/frequency locked spectrometer. Several variants of the
substitution method have been tested. Provid ed that the calibration
factor appropriate to the combination of tube and probe has b een
d e termined, a simple substitution method i s practicable but, on the
whole, the internal/external ·reference method with spinning concentric
cylindrical samples is to be preferred.

Keywords

Hrčak ID:

208031

URI

https://hrcak.srce.hr/208031

Publication date:

1.2.1969.

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