Abstract
The synthesis and crystal structure of Mg4(PO4)4·2C2H10N2 (UiO-20), which is the first example of an organically templated open framework magnesium phosphate, is described. UiO-20 is characterized by means of single-crystal and powder X-ray diffraction, solid-state 31P MAS NMR spectroscopy, and thermogravimetric analysis. Crystal data for UiO-20: space group C2/c (no. 15); a = 20.9098(8) Å, b = 17.8855(7) Å, c = 14.7913(6) Å; γ = 134.842(2)°; V = 3922.3(3) Å3; and Z = 8. The framework topology is of zeolite type DFT, and UiO-20 is isostructural with compounds such as the cobalt phosphate DAF-2, zinc phosphate DAF-3, zinc arsenate UCSB-3ZnAs, and gallium germanate UCSB-3GaGe. The structure has a 3D 8-ring channel system with protonated ethylenediammonium cations in the channel junctions. The material turns amorphous upon removal of the organic template on heating.
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