Difference Between Solid-State Nmr And Solution Nmr - JEOL JNM-ECA Series User Manual

1 OUTLINE OF SOLID-STATE NMR MEASUREMENT
1.2 DIFFERENCE BETWEEN SOLID-STATE NMR AND
SOLUTION NMR
The feature of solid high-resolution NMR that makes it different from solution NMR is
the ability to measure a solid sample as it is. In solution NMR, since an observed mole-
cule is dissolved in a solvent, almost all magnetic interactions except the spin-spin inter-
action can be eliminated by rapid molecular motion. Although the chemical bond struc-
ture of the molecule can be analyzed in detail by using high-resolution spectra in solution
NMR, since it is dissolved in the solvent, the special features of the solid state will be lost.
On the other hand, in solid-state NMR, the sample can be observed as it is.
However, analysis of the spectrum becomes difficult in solid-state NMR since the signal
becomes broad due to the influence of various magnetic interactions (
which have disappeared in solution NMR.
Usually, in solid-state NMR, in order to make a signal with a narrow line and to improve
the signal-to-noise ratio, the measurement combines the following three methods.
a.
High-speed magic angle spinning
b.
High-power
c.
X-H cross polarization
Techniques a and b are methods for narrowing the line of a signal. Moreover, c is a
method of improving the signal-to-noise ratio. Chapter 2 explains these techniques.
1-2
1
H decoupling
Sect. 2.1),
NMECAXS_V50-SLD-2