Resum
The effects of phase modulation due to homonuclear proton-proton coupling constants in HSQMBC-IPAP and HMBC-IPAP experiments are experimentally evaluated. We show that accurate values of small proton-carbon coupling constants, nJCH, can be extracted even for phase-distorted cross-peaks obtained from a selHSQMBC experiment applied simultaneously on two mutually J-coupled protons. On the other hand, an assessment of the reliability of nJCH measurement from distorted cross-peaks obtained in broadband IPAP versions of equivalent HMBC and HSQMBC experiments is also presented. Finally, we show that HMBC-COSY experiments could be an excellent complement to HMBC for the measurement of small nJCH values.
Idioma original | Anglès |
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Pàgines (de-a) | 509-516 |
Nombre de pàgines | 8 |
Revista | Magnetic Resonance in Chemistry |
Volum | 51 |
Número | 9 |
DOIs | |
Estat de la publicació | Publicada - de set. 2013 |
Publicat externament | Sí |