Abstract
High-resolution 13C spectra of calcium acetate hemihydrate (CAH), strontium acetate hemihydrate (SAH), and barium acetate monohydrate (BAM) have been obtained using cross-polarization (CP), high-power decoupling, and magic-angle spinning (MAS). The results indicate the existence in each case of four nonequivalent crystallographic sites for the acetate groups. These findings have been confirmed for SAH and BAM by single-crystal X-ray diffraction studies. The carboxyl chemical shifts for CAH cover a range of 9.3 ppm and the lines are remarkably sharp, so that this material is suggested as a suitable standard for checking the performance of CP/MAS spectrometers
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