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14 - COSY 1 - Polarization transfer In these experiments we...

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1 Polarization transfer In these experiments, we are trying to transfer magnetization from our sensitive, high γ , spins ( 1 H) to our insensitive, low γ , spins ( 13 C). Later, we will use this “polarization transfer” to correlate the 1 H spins with their 13 C partners Spin populations in this system before a selective inversion By inverting the H1 transition, we have altered the 13 C population difference: C1, it was 2 C and now it is -2 H + 2 C and C2 is now 2 H + 2 C. Recall that 2 H is 4 times greater than 2 C. Therefore, our enhancements are (-8+2=-6) and (8+2=10) or -3:5.
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2 The limitation of this experiment is that it is not general and it is desirable to perform a polarization transfer on all resonances at the same time. INEPT and DEPT are capable of this all at once transfer. INEPT: Insensitive Nuclei Enhanced by Polarization Transfer DEPT: Distortionless Enhancement by Polarization Transfer INEPT type pulse sequences:
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3 A population inversion on 1 H is achieved with this spin echo sequence.
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