SCHEDULED MAINTENANCE
Structural study of phosphate groups in layered metal phosphates by high-resolution solid-state31P NMR spectroscopy
Abstract
In studies of a series of crystals of layered metal phosphate compounds
by magic angle spinning (MAS) NMR spectroscopy, it has been found that
there is a distinct correlation between the
31
P isotropic
chemical shift value and the type of phosphate group. The isotropic
31
P chemical shifts of
(H
2
PO
4
)
-
,
(HPO
4
)
2-
and
(PO
4
)
3-
groups appear around δ
-10, -20 and -30, respectively. These assignments were
made unambiguously by measuring the
31
P MAS NMR spectra with
and without
1
H high-power decoupling together with the
cross-polarization transfer technique between
1
H and
31
P nuclei (CP MAS spectra).
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