Efficient measurement of the sign and the magnitude of long-range proton-carbon coupling constants from a spin-state-selective HSQMBC-COSY experiment

Josep Saurí, Teodor Parella*

*Autor corresponent d’aquest treball

Producció científica: Article en revista indexadaArticleAvaluat per experts

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Resum

A spin state-selective Heteronuclear Single-Quantum Multiple-Bond Connectivities (HSQMBC-COSY) experiment is proposed to measure the sign and the magnitude of long-range proton-carbon coupling constants (nJ(CH); n > 1) either for protonated or for non-protonated carbons in small molecules. The simple substitution of the selective 180° 1H pulse in the original selHSQMBC pulse scheme by a hard one allows the simultaneous evolution of both proton-proton and proton-carbon coupling constants during the refocusing period and enables a final COSY transfer between coupled protons. The successful implementation of the IPAP principle leads to separate mixed-phase α/β cross-peaks from which nJ(CH) values can be easily measured by analyzing their relative frequency displacements in the detected dimension.

Idioma originalAnglès
Pàgines (de-a)717-721
Nombre de pàgines5
RevistaMagnetic Resonance in Chemistry
Volum50
Número11
DOIs
Estat de la publicacióPublicada - de nov. 2012
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