Spin-state selection filters for the measurement of heteronuclear one-bond coupling constants

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Novel α/β-half-filter elements are proposed for the separation of the high-field and low-field component of 1JHC and 1JHN splittings into different subspectra. The α/β-half-filter elements are of the same duration as the S3CT pulse sequence element and, like this, are less sensitive to cross talk between different subspectra than the original shorter α/β-half-filters. The filter elements are demonstrated with the measurement of 1JHC coupling constants of CαH groups in 2D and 3D experiments and the subspectral editing of the four different multiplet components observed in two-dimensional α/β-HSQC-α/β spectra recorded without heteronuclear decoupling in either dimension.

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