Abstract
Several alkali rare-earth polyphosphates have been analyzed by high-resolution <sup>31</sup>P 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 NH<sub>4</sub>LaP<sub>4</sub>O<sub>12</sub> cyclophosphate and in M<sup>I</sup><sub>2</sub>La(PO<sub>3</sub>)<sub>5</sub> (M = NH<sub>4</sub>, K) and M<sup>I</sup>Ln<sup>III</sup>(PO<sub>3</sub>)<sub>4</sub> (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.
PDF Article
More Like This
Cited By
You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Login to access Optica Member Subscription