Solid-state heteronuclear multiple-quantum correlation experiment

We present a solid-state nuclear magnetic resonance (NMR) experiment that allows the observation of a high-resolution two-dimensional heteronuclear correlation (2D HETCOR) spectrum between aluminum and phosphorous in aluminophosphate molecular sieve VPI-5. The experiment uses multiple quantum magic angle spinning (MQMAS) spectroscopy to remove the second order quadrupolar broadening in Al nuclei. The magnetization is then transferred to spin-1/2 nuclei of P via cross polarization (CP) to produce for the first time isotropic resolution in both dimensions. 

The H-n.m.r. spectra of various carrageenan-derived oligosaccharides have been analysed by means of DQ COSY and H- C-correlated methods. H- and C-asagnments have been reported for sialylated oligosaccharide alditols related to mucins, and for the pentasaccharide of the genus-specitic epitope of Chlamydia lipopolysaccharide. The structure of the fully methylated alditol acetate of 16 has been determined solely on the basis of n.m.r. data. A natural abundance heteronuclear-multiple-quantum-coherence (HMQC) experiment has been iUustrated by use of trisaccharide Lewis glucal. The solid state n.m.r. spectra of A-acetylurea derivatives obtained by reaction of hyaluronic acid with isotopically-labelled carbodiimides have been recorded. ... 

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