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Summary AQA A level chemistry NMR revision notes
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A helpful and comprehensive set of revision notes covering the entire nuclear magnetic resonance spectroscopy unit of AQA A level chemistry
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SRUCWRI ANALYSISNucear maqnetic resonana spetroscopy (NMR) is used to tind The
ato ms
struciurcs of mclecules. hn energy chornqe in the nucle ot
the sonpl is detelted EM energy is enited and interpreted by
computer.
Carbon -)3 NMR
C carbon does have nuclear spin odd mass numbe
Cabon atoms n ditteent tunctroral qrouyps tee the magnetie tiud
dittrently shielded by eledrons
greatee electron density, smale chemcal shitt.
Chemica shitt 5is measwed in pats ger mllio (ppm)
(arbon atoms atteent envrcnments qive ditteent chemica shitts.
meas ured in relation to teBramethylsilane stardard
’ENERGy
Ethanot
H TMS
H
200
peak at 60 Ppm
peo k ct Is ppm Chemcal shittppm
Electronegative uxygin atom deshielas the carbon aton next to it.
so it hos a higner chem ical shitt vaue.
ENERy
eg- Propanal
H H
H TMS
2
H H
200 SO
Lhemca shittppm
20s pp
’ 3 untteet carocn environments.
Height oj peaks in "2 NMR specira ue not siqicant
Be awae ot syimmetry in moleules.
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