17 - NOESY - 4 Another example: The signs of cross peaks...

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1 NOESY We have learned about the 1D NOE difference experiment. Now we complete our discussion with the 2D version. To review: The experiment without mixing:
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2 With mixing, dipolar interactions are seen on top of the “parent” frequency: The pulse sequence in a little more detail
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3 A (somewhat) complicated example: •q h a s a n N
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Unformatted text preview: 4 Another example: The signs of cross peaks when compared with the diagonol: 5 Walking the backbone: What to do when the NOE is zero ( c =1.12): Change spectrometer frequency Change the temperature Change the viscosity Run a ROESY 6 ROSEY A new axis for dipolar interactions: the rotating frame All NOEs (rotating frame NOEs) are above average; that is, they are positive....
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17 - NOESY - 4 Another example: The signs of cross peaks...

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