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À propos de : Probing Proton−Proton Proximities in the Solid State: High-ResolutionTwo-Dimensional 1H−H Double-Quantum CRAMPS NMR Spectroscopy        

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  • Probing Proton−Proton Proximities in the Solid State: High-ResolutionTwo-Dimensional 1H−H Double-Quantum CRAMPS NMR Spectroscopy
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  • A new 1H DQ (double-quantum) CRAMPS (combined rotation and multiple-pulse sequence) solid-state nuclear magnetic resonance experiment incorporating DUMBO homonuclear 1H dipolar decoupling is presented. The major resolution enhancement enables DQ peaks corresponding to all 22 close (<3.5 Å) proton−proton proximities in the dipeptide β-AspAla to be observed. In particular, the DQ CRAMPS spectrum provides access to the alkyl region of the spectrum and yields a clear assignment of the two CH and two diastereotopic CH2 proton resonances.
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