Is a nucleus that absorbs at 0.9 6 more shielded or less shielded than a nucleus

Question

Is a nucleus that absorbs at 0.9 6 more shielded or less shielded than a nucleus that absorbs at 3.25 8? Does the nucleus that absorbs at 0.9 delta require a stronger applied field or a weaker applied field to come into resonance than the nucleus that absorbs at 3.25 8? Is a nucleus that absorbs at 6.5 8 more shielded or less shielded than a nucleus that absorbs at 3.2 delta? Does the nucleus that absorbs at 6.5 8 require a stronger applied field or a weaker applied field to come into resonance than the nucleus that absorbs at 3.2 delta?

Explanation / Answer

Protons that are less shielded from the applied magnetic field will sense a larger effective magnetic field and will require a higher frequency.

The greater the chemical shift, the higher the frequency.

a) Nucleus that absorbs 0.9 is more shielded than the nucleus that absorbs at 3.25.

Nucleus that absorbs 0.9 is required less applied magnetic field than the nucleus that absorbs at 3.25.

b) Nucleus that absorbs 6.5 is less shielded than the nucleus that absorbs at 3.2.

Nucleus that absorbs 6.5 is required more applied magnetic field than the nucleus that absorbs at 3.2.

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