After crystallization during ionothermal syntheses in phospho-nium-containing ionic liquids, the structure of (NH)Al(PO) [tri-ammonium dialuminum tris-(phosphate)] was refined on the basis of powder X-ray diffraction data from a synchrotron source. (NH)Al(PO) is a member of the structural family with formula Al(PO), where is a group 1 element, and of which the NH, K, and Rb forms were previously known. The NH form is isostructural with the K form, and was previously solved from single-crystal X-ray data when the material (SIZ-2) crystallized from a choline-containing eutectic mixture [Cooper (2004 ▸). , , 1012-1017]. Our independent refinement incorporates NH groups and shows that these NH groups are hydrogen bonded to framework O atoms present in rings containing 12 sites in a channel along the axis direction. We describe structural details of (NH)Al(PO) and discuss differences with respect to isostructural forms.
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| http://dx.doi.org/10.1107/S2056989019015330 | DOI Listing |
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