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

摘要

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 [Al-2(HPO4)(PO4)(2)](C4N2H14)(H2O), crystallizes in the orthorhombic space group Pna2(1) (No. 33) with a=9.602(16)angstrom, b=9.26(2)angstrom, c=16.03(3)angstrom, Z=4, R-1=0.0498 and wR(2)=0.1217, The second solid, MDAE-1, with the empirical formula [Al-2(HPO4)(PO4)(2)](C3N2H12)(H2O), crystallizes in the same space group with a=9.4250(19)angstrom, b=9.3170(19)angstrom, c=15.907(3) angstrom, Z=4, R-1=0.0407 and wR(2)=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 x 8 net. MDAP-3and MDAE-1 represent the first examples of two-dimensional layered aluminophosphates with the Al2P3O12 stoichiometry and containing AlO6, octahedra. (c) 2005 Elsevier Inc. All rights reserved.