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Summary OCR A level chemistry NMR notes chapter 29
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Detailed notes on NMR made using the OCR A, A level chemistry textbook. Chapter 27
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Nuclear Magnetic ResonanceNMR Arrangementof specificatoms compound structure
Requirements Strongmagnetic field
Radiofrequency electromagnetic radiation
Radio Frequency Absorbed nucleon Spin States change
by nucleus between 2x states
flip
Nuclear Spin Significant if Odd N nucleons i e odd mass N
CB r H other odd isotopes
ie F p
2x States Opposed T energy Relative Magnetic
Aligned t energy Field
1
Energy difference dep magneticfieldstrength
11 t energy N.BA
4 X Tenergy smallenergy
difference
Andetadiation
changespin
EnergyAbsorption AbsÊÊÊÊÉÊÊ
Aligned nuclei Opposedstatenuclei
f Release
energy
Changespin
Résonance
Nucleus absorb energy spin flip between 2x states
N B Onlyobserve w UnpairedSpin
need odd mass N isotopes
NMRSpectrum Spin return originalstate Release energy
Measure released
energy
, gy
ElectronShielding t magneticfield experiencedby nuclei
Atom's e neighbouring atom
t
Shield nucleus from effectof strong magnetic field
NB Whatatom bonded to electronegativity
ofneighboring atoms allects
magnetic field experienced bynucleus
dep position within molecule
Environments Differenttypesof environment atom producing signal
is bonded to diff atoms gpsof atoms
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