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Summary OCR A level chemistry NMR notes chapter 29

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NMR and Spectroscopy (H432)
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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 Resonance
NMR 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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Subject
Chemistry A
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