IPAP-HSQMBC: measurement of long-range heteronuclear coupling constants from spin-state selective multiplets.
J Magn Reson
; 207(2): 312-21, 2010 Dec.
Article
em En
| MEDLINE
| ID: mdl-20952232
ABSTRACT
A new NMR approach is proposed for the measurement of long-range heteronuclear coupling constants ((n)J(XH), n>1) in natural abundance molecules. Two complementary in-phase (IP) and anti-phase (AP) data are separately recorded from a modified HSQMBC experiment and then added/subtracted to provide spin-state-selective α/ß-HSQMBC spectra. The magnitude of (n)J(XH) can be directly determined by simple analysis of the relative displacement between α- and ß-cross-peaks. The robustness of this IPAP-HSQMBC experiment is evaluated experimentally and by simulation using a variety of different conditions. Important aspects such as signal intensity dependence and presence of unwanted cross-talk effects are discussed and examples on the measurement of small proton-carbon ((n)J(CH)) and proton-nitrogen ((n)J(NH)) coupling constants are provided.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Espectroscopia de Ressonância Magnética
Idioma:
En
Ano de publicação:
2010
Tipo de documento:
Article