NMR spectroscopy is one of the best instrument to determine to the structure of an organic compound. This note help to understand the theoretical approach to the NMR spectroscopy. And how to analyse the NMR graph to determine the actual and accurate structure of the organic molecule.
NucLEAR MAGNETIG. RESONANCE
NUCLE AR - SPIN SPECTROSCOPY
Nuclei StGNALS THEREBY
f certain
bar- maqnets. Sueh e o is otopes behave as tiny
poe dd number e rtowo mlei ae hoe,whah!
on neutons. Jhet
haia
uanent& aud quamtileol au eleBo hawe þermanet
monetum Shin stales.Jhe
hein spin generated ly nuclen shin
mmber I, whic ,dapeuda
hawe vaues -
rAcleu). (deteuding
Sueh sbin nmber 0 u also relaled i
he w s no. au atoie no. o au adom. Ohe
ypeo nuclei aud sþim mumber cau be
adegeriud
Trets OF MASS
NcLEuS NO
ATOMIG
ExAMPLES
,N,
ede
Tytr2 wen
Typei3
odd
3hote nucdei shic hawe Shin
ban magnet aud o.I+o be have
þoeseao 'a
Bven muclei ane plaeed n a magneti fiell . then
are imadiated l
maty absorb
lechomagnete enengy, cli
Nuclea, Magaeie Resonaca
aiatiein reatshaeife values: Oltep
Knen as Ndean mAgneheTe0auCe
Shechescefy
aloeve(I +o)a Caube sudied lay NMR aud la ife2
or NMR Studieo
studies Jhe NMR WaingH are effen Gaed
Petew masneie esowauee, (PMR) audcas 3c-NMR.
, (2)
ErFECT OF ExTERNAL MAGNETIG FIELD;
Jhe nu cleus of ordinary hydgen H w ike au
-elecren , s Spin no. o bo ca aaoume
(2T +1), ie, 2x+ =2) spin states, ty aud- .
Sie i elon i elechricalhy changed,
preten Jeucrates a tiny uagneie ouent -one tat
deineides uik lhe ais ofspi
of Jhis tiny
tiny agnatie
a tiy kuraagnti
Direchn Moqnetie
ines
frctadiy force
Abar magnet aud
us lines of ferce.
Nhen a Ceupound londaining hydrege (aud Uua prtko)
is piaed
oTientaic wilk Teote et to lka external mamee
felt. Ihe magnetie womant of 4 preten may be akg
11
againat atslied wagnetie feld give rie ;
to two searaded eneg stales as folows;
Two pozgible (lowereneig)"
Ho C=tpid magnehi fela)
Sn au extermal magehe feld, tu alignmana o aprolon
neries will be kere. when l prele
feld
PRECE SSiONAL MoTION Under Ue infweee of au
esternal nagnei
moves uwa feld, froter, ashinning agne
charaelerishe way (tuke a shinnng o)
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