Abstract
Abstract The syntheses and crystal structures of a novel layered zinc phosphate and its high temperature variant are described. Both structures were solved from powder diffraction data using both synchrotron and conventional X-ray radiation. The as-synthesized material (UiO-27-as) with composition [C6H17N3]2+[Zn3(HPO4)(PO4)2]2−·H2O crystallizes in the space group P21/c with a=12.67072(15), b=8.24293(8), c=18.48425(19) A, β=109.1346(7)° and V=1823.904(35) A3. The zinc phosphate layers are built from corner sharing hexameric secondary building units. In the interlamellar space there are organic cations and water molecules. A high temperature variant exists around 200°C (UiO-27-200). This compound [C6H17N3]2+[HZn3(PO4)3]2− crystallizes in the monoclinic space group P21/c with a=12.29010(23), b=8.39995(13), c=18.49914(30) A, β=114.2504(11)° and V=1741.261(51) A3. The transformation to UiO-27-200 involves removal of the interlamellar water molecules. The atomic arrangement within the zinc phosphate layers is maintained; however, the layers are brought closer which leads to inter-layer hydrogen bonding interactions.
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