News & Notices
Organizations & People
Standing
Committees
Divisions
Projects
Reports
..By Year
..By Division
..Other Committees
..Provisionals
Publications
Symposia
AMP
Links
of Interest
Search
the Site
Home
Page
|
|
Pure Appl. Chem., Vol. 69, No. 12, pp. 2489-2495, 1997.
PHYSICAL CHEMISTRY
DIVISION
COMMISSION ON MOLECULAR STRUCTURE AND SPECTROSCOPY
Parameters and Symbols
for Use in Nuclear Magnetic Resonance
(IUPAC Recommendations 1997)
FOOTNOTES
- Note that confusion might arise when the so-called alphabet expansion
is used for D,
since this includes a term D which is not the dipolar coupling
constant.
- M rather than m is frequently recommended, but most
NMR practitioners use m so as to avoid confusion with magnetization.
- Whereas earlier IUPAC recommendations give a definition of d
which requires that the "unit" ppm is not stated when values are quoted,
this is largely ignored and a change of recommendation is under consideration.
- z = 2Ds
/ 3
- The symbols s (and related terms
for components), sj,
s||,
s
should refer to shielding on an absolute scale (for theoretical work).
For shielding relative to a reference, symbols such as s||
- sref should
be used.
- For tensors, doubled subscript capital letters X, Y
and Z should generally be used for principal components,
e.g. sXX , sYY
and sZZ for shielding.
Alternatively, numerical subscripts may be used (e.g. s11
, s22 , s33)
- The symbol k
may also be used for magnetic susceptibility, some authors reserving
c for unrationalised units.
Back to Index
Page last modified 12 June 2000.
Copyright ©1997-2000 International Union of Pure and Applied Chemistry.
Questions or comments about IUPAC, please contact, the Secretariat.
Questions regarding the website, please contact web
manager.
|