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  • Title: Solid-state NMR spectroscopy of anionic framework aluminophosphates: a new method to determine the al/p ratio.
    Author: Zhou D, Xu J, Yu J, Chen L, Deng F, Xu R.
    Journal: J Phys Chem B; 2006 Feb 09; 110(5):2131-7. PubMed ID: 16471794.
    Abstract:
    A series of anionic framework aluminophosphates, with different Al/P ratios, have been investigated by various solid-state NMR techniques, including 27Al, 31P magic angle spinning (MAS), 27Al-->31P cross polarization (CP), 27Al{31P} rotational echo double resonance (REDOR), and 31P{27Al} transfer of population double resonance (TRAPDOR). Different Al coordinations (AlO4b, AlO5b, and AlO6b) and P coordinations (PO4b, PO3bOt, PO2bO2t, and PObO3t), where b represents bridging oxygens and t represents terminal oxygens, can be unambiguously determined based on the solid-state NMR spectroscopy. Furthermore, a new method to determine the Al/P ratio of open-framework aluminophosphates has been established, which is useful for the understanding of unknown aluminophosphate structures.
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