NMR pt 2

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7 Terms

1
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what is COSY?

shows correlations between protons

2
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what does COSY show?

diagonal peak - protons coupling to itself

cross peak = protons coupling to others

3
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what is HMQC?

H NMR (x) vs C NMR (y)

4
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what is HMBC?

H NMR (x) vs C NMR (y)

2-3 (and 4) bond coupling between H and C

5
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what is the nuclear overhauser effect (nOe)? what causes it? what type of interaction?

changes in signal intensity on spectrum

usually protons less than 4Å apart

arises because magnetic nuclei affect each other’s relaxation

through space dipole-dipole interaction

6
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how is nOe measured?

1D spectrum

irradiate signal and look for changes between equilibrium and nOe spectrum

<p>1D spectrum</p><p>irradiate signal and look for changes between equilibrium and nOe spectrum </p>
7
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what do 2D NOESY experiments measure?

measure all the nOes simultaneously

cross peaks indicate nOe rather than coupling

1H-1H axes