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Solid-state NMR studies of 17 O-enriched pyrophosphates

For the first time, 17 O NMR studies were performed on 17 O-enriched crystalline pyrophosphates (magnesium-, sodium- and bariumpyrophosphate) by means of triple-quantum magic-angle spinning (3QMAS) and double-rotation (DOR) in the high external field of 17.6 T. Oxygen atoms in bridging positions (P–OB–P) exhibit a significant higher quadrupole coupling constant compared to oxygen atoms in terminal positions (P–OT). With increasing cationic radius a higher value of the chemical shift of the terminal oxygen atoms is observed.