Layered Aluminophosphate Research Articles

Synthesis of a mesoporous aluminophosphate

The synthesis of mesoporous materials, such as the M41S type, initiated intense research into the synthesis and properties of novel mesoporous materials. This research has led to the discovery that compositions other than silicates or aluminosilicates, particularly oxides and phosphates, can be organized into three-dimensional porous or layered compounds. In this paper we report on the synthesis of a mesoporous and a layered aluminophosphate. The starting solutions were prepared by dissolution of a hydrated aluminophosphate in HF, followed by treatment with solutions of cetyltrimethylammonium bromide in tetramethylammonium hydroxide. The products were characterized by X-ray powder difrfraction, thermal analysis, NMR and surface area measurements. Because of the presence of significant quantities of HF the synthetic pathway was most likely S +F −I +.

Synthesis and structure of Mu-4, the new layered aluminophosphate [(C 2H 5) 2NH 2] 4[Al 8P 10O 40H 2]·[H 2O] 2.5

The title compound (named Mu-4) is a new layered aluminophosphate with a unusual A1/P ratio for this kind of materials. Mu-4 was obtained from a quasi non-aqueous mixture involving mainly diethylformamide (DEF) as solvent, in addition to limited amounts of water. DEF is decomposed during the synthesis and the resulting protonated diethylamine is occluded in the as-synthesized material. The crystal structure was determined by single crystal X-ray diffraction. The symmetry is triclinic, a=8.632(4) Å, b=9.267(7) Å, c= 17.461(10) Å, α=86.66(5)°, β=82.20(4)° and γ=89.28(5)°, space group P-1. The structure consists of anionic double sheets essentially built from double 4-ring (D4R) units. The inorganic layers are in strong interaction with water and the protonated amine which is located in the interlayer spacing. Another type of diethylamine protrudes into the 8-membered rings (8-MR) present in the layers. The characterization of this new aluminophosphate by 13C, 27Al and 31P solid state NMR spectroscopy is also reported.

Synthesis and Characterization of A Novel Layered Aluminophosphate of Kanemite-like Structure

The synthesis and structural characterization of a novel layered aluminophosphate (named AlPO-ntu) with a structure mimicking to that of the naturally occurring silicate mineral kanemite are described. This new compound was synthesized using the hydrothermal method and n-alkylamines as templates. On the basis of the results of thermal and elemental analysis, the chemical formulas were determined to be AlPO3(OH)2[NH2(CH2)xCH3] (x = 3, 5, and 7) for templates of butyl-, hexyl-, and octylamines, respectively. Solid-state 27Al and 31P MAS NMR spectra showed that both elements were in tetrahedral coordination. FT-IR spectra and ion-exchange studies revealed that three of the tetrahedra oxygen are bridging between Al and P atoms. The fourth oxygen, pointing away from the aluminophosphate sheet, bears either a proton when adhering to aluminum or an alkylammonium ion when adhering to phosphorus. The alkylammonium ions are ready for ion-exchange, while the protons attached to the Al−O terminals are not exchangeabl...

The pore size modification of a layered aluminophosphate [Al3P4O16C9H24N3] by rational selection of the intercalated template cation

The synthesis and structure of a novel layered aluminophosphate containing a twelve-membered ring using a cyclic organic diamine is described; the effective pore size of the ring is modified from 6.6 to 3.3 A by the pore blocking action of the intercalated template ion.

The synthesis and structure of a chiral layered aluminophosphate containing the template Co(tn)3 3+

A chiral layered aluminophosphate Co(tn)3·Al3P4O16·2H2O containing only one enantiomer of the metal complex is synthesized using racemic Co(tn)3Cl3 as the templating agent and its structure determined using single-crystal X-ray diffraction.

A reactive template in the synthesis of a novel layered aluminium phosphate (Al3P4O16)3–[NH3(CH2)5NH3]2+(C5H10NH2)+

Starting from 1,5-diaminopentane as template it is possible to produce a novel microporous layered aluminophosphate (Al:P = 0.75) in which there are two distinct kinds of eight-membered rings within the layers: those that are approximately circular (diameter 7.0 A) accommodate piperidinium ions, while the elliptical ones (ca. 5.9–8.0 A) contain 1,5-diammoniumpentane ions.