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Separation of non-protonated from protonated carbon NMR resonances in solids by inversion-recovery cross polarization

✍ Scribed by D.G. Cory

Publisher: Elsevier Science
Year: 1988
Tongue: English
Weight: 278 KB
Volume: 152
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(88)80121-0

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✦ Synopsis

It is demonstrated that inversion-recovery cross polarization methods may be successfully employed to detect non-protonated resonances in high-resolution solid-state NMR. By incorporating a short inverse polarization ttme ( zz I50 us) after the normal cross polarization period, the resonances of carbons with directly bonded protons may be inverted. Non-protonated carbons appear attenuated, but with the normal phase since their cross relaxation rate is much slower. This method is suggested as a replacement for the commonly employed dipolar dephasing or interrupted decoupling experiment. Examples are shown from sucrose, 2,2'-dihydroxybenzophenone, 2,6-dimethylnaphthalene and paradimethoxybenzene.

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✍ Maili Liu; R. Duncan Farrant; John C. Lindon 📂 Article 📅 1992 🏛 John Wiley and Sons 🌐 English ⚖ 312 KB

## Abstract An efficient method of measuring proton spin–lattice cross‐relaxation rates in small molecules is proposed. The method involves measuring the difference in relaxation rates in a non‐selective experiment and in one with all resonances except one of interest inverted. This procedure yield