What is NMR Spectroscopy

Thiswillcauseagreaterchemicalshiftthisfact

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Unformatted text preview: r
range
from
0‐220ppm.


 Chemical
Shifts
 A
 chemical
 shift
 is
 the
 difference
 
 (ppm)
 between
 the
 resonance
 frequency
 of
 the
 proton
being
observed
and
that
of
trimethylsilane
(TMS).


 A
nucleus
will
be
de‐shielded
due
the
presence
of
electronegative
atoms
as
well
as
 the
de‐saturation
of
a
molecule.

This
will
cause
a
greater
chemical
shift.

This
fact
 can
be
confirmed
by
the
analysis
of
Figure
1,
and
Figure
2
for
carbon
13,
you
should
 also
know
the
trends
for
proton
as
well.


 Figure
1:
Relative
Che...
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This note was uploaded on 02/22/2014 for the course PUBLIC HEA 832:338 taught by Professor Berger during the Spring '08 term at Rutgers.

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