분석화학 기기 이론(NMR)

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분석화학 기기에 관한 이론 정리

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Deeper inspection on the coupling(NMR)
1) Coupling mechanism
2) Magnetic equivalence
3) Coupling analysis
4) Alkenes
5) Mechanism of coupling of alkenes
6) Protons on Oxygen
7) Acid (or alcohol )/ water mixture
8) Proton on Nitrogen

본문내용

1) Coupling mechanism
A) Dirac vector model
Energy state of spins of nucleus and electron
The most stable condition in a bond
According to Pauli principle, pairs of electrons in the same orbital have opposed spins.
Carbon 12 exhibits no spin
Coupling in a typical hydrocarbon
Nuclear spin information is transferred via partial orbital overlap that exists between adjacent CH bond orbitals
Two possible arrangements of nuclear and electronic spins for two coupled protons

B) Coupling constant
magnitude of the coupling constant between two adjacient CH bonds depends on the dihedral angle
Comparison with Dirac model
Example of the relationship between Direc model and J
The ring is locked in the indicated conformation due to t-buthyl group (must be equatorially)

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