29.2 NMR Flashcards
what is nuclear spin?
when the nucleus spins due to there being an odd number of protons and neutrons
what nuclei have an odd number of protons and neutrons?
H1
C13
F19
P31
what is resonance?
when a nucleus absorbs energy and flips between two spin states
what is the unit of NMR?
chemical shift
what is used as the standard reference in NMR?
TMS
Si(CH3)4
what is a deuterated substance?
a substance where H1 atoms are replaced by H2 atoms
do deuterated substances show up on NMR?
no
what is the main used of deuterated substances?
solvents for NMR
what happens when D2O is added to a spectrum?
all the O-H and N-H peaks dissappear
because
D2O replaces all the protons with D
what are examples of two deuterated substances?
CDCl3
D2O
what is D2O used for?
to identify protons on OH or NH
what is CDCl3 used for?
a solvent
