Synthesis and characterization of two aluminophosphates templated by N-methyl-1,3-diaminopropane

Two crystalline aluminophosphates have been synthesized under hydrothermal conditions using N-methyl-1,3-diaminopropane (MeDAP) as structure-directing molecule. The first one, denoted MDAP-1 is observed as an intermediate phase during the crystallization of the final product MDAP-2. The structure of MDAP-1, a 2D-layered compound with the empirical formula (C4H14N2)1.5[Al3P4O16] was refined using powder X-ray diffraction data. It crystallizes in the monoclinic space group P21/c (No. 14) with a=14.080(10) Å, b=8.4763(1) Å, c=18.9954(1) Å, β=100.95(5)° and image. Inorganic sheets contain a novel 4×6 net, constructed from capped 6-membered rings. The sheets are held together by partially disordered, doubly protonated MeDAP molecules. Single crystal analysis showed that MDAP-2 is isostructural with AlPO4-21 and crystallizes in the monoclinic space group P21/n (No. 14) with a=8.488(6) Å, b=17.72(2) Å, c=9.024(6) Å, β=106.96(5)° and image. MDAP-2 differs from AlPO4-21 by the presence of an octahedrally coordinated aluminum in the framework.