nmr Flashcards
1
Q
what does NMR stand for
A
nuclear magnetic resonance
2
Q
What are nucleons
A
protons and neutrons
3
Q
when do nuclei have spin
A
odd number of nucleons (protons and neutrons)
4
Q
What is resonance
A
The nucleus has 2 diff spin states with diff energy.
5
Q
What is used as a refrence for the standard shift
A
TMS
6
Q
when is a deuterated solvent used
A
C13 and H1 both present. Will replace H1 with H2. Normally CDCL3 used
7
Q
The non-toxic, inert substance TMS is used as a standard in recording both 1H and 13C
n. m.r. spectra.
(i) Give two other reasons why TMS is used as a standard in recording n.m.r. spectra
A
can be easily removed
doesn’t interfere with other peaks