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Hadamard Long-Range Proton–Carbon Coupling Constant Measurements with Pulsed Field Gradients

✍ Scribed by T. Nishida; G. Widmalm; P. Sándor

Publisher
John Wiley and Sons
Year
1996
Tongue
English
Weight
416 KB
Volume
34
Category
Article
ISSN
0749-1581

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✦ Synopsis

Sources of artifacts in

Hadamard spectra were investigated and identified as insufficient suppression of signals from solvent, protons attached to "C atoms and error signals caused by non-ideal excitation and the subsequent Hadamard transformation. Pulsed field gradients (PFG) effectively eliminate the former error signals while reoptimized Hadamard-shaped pulses produce practically ideal excitation and Hadamard transformation affords artifact-free spectra. Long-range "C-'H coupling constants of 1,6-anhydro-~-~-galactopyranoside and 3acetylpyridine were determined by using a PFG pulse sequence and re-optimized Hadamard-8 shaped pulses.

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