title: Solid-state NMR studies of 17O-enriched pyrophosphates.
abstract: For the first time, 17O NMR studies were performed on 17O-enriched crystalline pyrophosphates (magnesium-, sodium- and barium-pyrophosphate) 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.
authors.affiliation: Abteilung Grenzflächenphysik, Universität Leipzig, Linnéstr. 5, 04103 Leipzig, Germany.
authors.forename: Daniel
authors.initials: D
authors.lastname: Prochnow
authors.forename: Arnd-Rüdiger
authors.initials: AR
authors.lastname: Grimmer
authors.forename: Dieter
authors.initials: D
authors.lastname: Freude