Abstract
Abstract In this study, the 31 P chemical shielding anisotropies in six condensed phosphates (K 4 P 2 O 7 , Na 4 P 2 O 7 , K 5 P 3 O 10 , (NaPO 3 ) n , Al 4 (P 4 O 12 ) 3 , and P 4 O 10 ) and in a phosphosilicate glass are measured with 31 P nuclear magnetic resonance (NMR) spectroscopy From an analysis of spectra of staionary samples and with samples spinning at the “magic angle”, the principal components of the chemical shielding are determined for the multiple species in each compound. For each condensed phosphate, the 31 P NMR spectrum is the superposition of characteristic powder patterns of the end-, middle-, and branching-phosphate units. The shielding is interpreted in terms of the structure of each archetypal phosphate group and a correlation is presented which shows that the bonding of phosphate groups in solids is well characterized by the chemical shielding anisotropy and asymmetry.
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