31P MAS-NMR Study of Some Alkali Rare-Earth Cyclo- and Polyphosphates

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Abstract:

Several alkali rare-earth polyphosphates have been analyzed by high-resolution 31P MAS-NMR (magic angle spinning nuclear magnetic resonance) spectroscopy. From their NMR spectra, the number and the multiplicity of crystallographic sites have been analyzed in the NH4LaP4O12 cyclophosphate and in MI 2La(PO3)5 (M = NH4, K) and MILnIII(PO3)4 (M = Li, Na, Ag, K, Rb, Cs, Tl; Ln = La, Sm), long-chain polyphosphates. A linear dependence of NMR isotropic chemical shift values on the mean POP angles of the chain, calculated from data published on isostructural compounds, has been deduced. Chemical shift anisotropies of NMR components have been analyzed in terms of the structural characteristics of the environment of P atoms.

Keywords: 31P NMR SPECTROSCOPY; ALKALI RARE-EARTH PHOSPHATES; CHEMICAL SHIFT TENSOR; CYCLOPHOSPHATES; POLYPHOSPHATES

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702001948457

Affiliations: 1: Instituto de Ciencia de Materiales de Madrid, CSIC, Cantoblanco, 28049 Madrid, Spain 2: Departement de Chimie, Institut Superieur de l’Education et de la Formation Continue, 43 rue de la Liberte, 2019 Le Bardo, Tunisia 3: Centre de Chimie Appliquee, Institut National de la Recherche Scientifique et Technique BP 95, Hammam-Lif 2050, Tunisia

Publication date: October 1, 2000

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