mouradfsm
Well-Known Member
NMR Chemical Shifts of Common
Laboratory Solvents as Trace Impurities
In the course of the routine use of NMR as an aid for
organic chemistry, a day-to-day problem is the identification
of signals deriving from common contaminants
(water, solvents, stabilizers, oils) in less-than-analytically-
pure samples. This data may be available in the
literature, but the time involved in searching for it may
be considerable. Another issue is the concentration
dependence of chemical shifts (especially 1H); results
obtained two or three decades ago usually refer to much
more concentrated samples, and run at lower magnetic
fields, than today’s practice.
We therefore decided to collect 1H and 13C chemical
shifts of what are, in our experience, the most popular
“extra peaks” in a variety of commonly used NMR
solvents, in the hope that this will be of assistance to
the practicing chemist.
Laboratory Solvents as Trace Impurities
In the course of the routine use of NMR as an aid for
organic chemistry, a day-to-day problem is the identification
of signals deriving from common contaminants
(water, solvents, stabilizers, oils) in less-than-analytically-
pure samples. This data may be available in the
literature, but the time involved in searching for it may
be considerable. Another issue is the concentration
dependence of chemical shifts (especially 1H); results
obtained two or three decades ago usually refer to much
more concentrated samples, and run at lower magnetic
fields, than today’s practice.
We therefore decided to collect 1H and 13C chemical
shifts of what are, in our experience, the most popular
“extra peaks” in a variety of commonly used NMR
solvents, in the hope that this will be of assistance to
the practicing chemist.
