Synthesis, characterization and structure determination of two isotypes of a layered aluminophosphate with a new 2D network topology

Two isotypes of a new layered aluminophosphate, further denoted MDAP-3 and MDAE-1, have been synthesized under hydrothermal conditions using N-methyl-1,3-propanediamine and N-methyl-ethylenediamine, respectively. MDAP-3, with the empirical formula [Al2(HPO4)(PO4)2](C4N2H14)(H2O), crystallizes in the orthorhombic space group Pna2(1)Pna2(1) (No. 33) with a=9.602(16)Å, b=9.26(2)Å, c=16.03(3)Å, Z=4Z=4, R1=0.0498R1=0.0498 and wR2=0.1217wR2=0.1217. The second solid, MDAE-1, with the empirical formula [Al2(HPO4)(PO4)2](C3N2H12)(H2O), crystallizes in the same space group with a=9.4250(19)Å, b=9.3170(19)Å, c=15.907(3)Å, Z=4Z=4, R1=0.0407R1=0.0407 and wR2=0.0954wR2=0.0954. The two compounds possess the same layer topology. Inorganic layers contain PO3=O, PO3OH, AlO4 and AlO6 polyhedra, linked together to generate a new 4×8 net. MDAP-3 and MDAE-1 represent the first examples of two-dimensional layered aluminophosphates with the Al2P3O12 stoichiometry, and containing AlO6 octahedra.

Graphical abstractTwo aluminophosphates with a new layer topology have been synthesized hydrothermally in the presence N-methyl-1,3-propanediamine and N-methylethylenediamine; they represent the first examples of two-dimensional layered aluminophosphates with the Al2P3O12 stoichiometry and containing AlO6 octahedra.Figure optionsDownload full-size imageDownload as PowerPoint slide