Synthesis Of Aluminophosphate Research Articles

An Organo-templated Iron Zincophosphate with Zeolite DFT Topology

The synthesis and application of open-structured materials are an active area of solid-state chemistry research due to their specific properties such as catalytic, ion exchange and intercalation. After the successful synthesis of aluminophosphates, templated metal phosphates with open-framework have been extensively studied to discover new architectures and compositions. Among the open-framework phosphates, the zincophosphates are the second largest family that have been studied in the past decade. Since the first zincophosphate with zeolite topologies reported by Stucky and co-workers, a great deal of effort has been devoted to the pursuit of novel structures within this system. Their structures consist of vertex-sharing networks of ZnO4 and PO4 tetrahedra, corresponding to anionic framework [ZnPO4−], that are equivalents to those encountered in aluminosilicates of composition [AlSiO4−]. Zincophosphates with zero-, one-, twoand three-dimensional architectures have been isolated. A large number of iron phosphates have also been synthesized in the past ten years. Probably, the most striking example of this family is the mineral cacoxenite that contains cylindrical tunnels of 14.2 A. Another goal is incorporation of active metals into known phases to improve their catalytic properties. Transition metal substituted aluminophosphates are successful examples of this approach and have given rise to some new topologies. Iron incorporated open-framework materials have shown interesting catalytic performances. However, there is no example of open-framework compound that has both iron and zinc. Such materials may be interesting in view of developing new catalysts. Previously, we have synthesized several zincophosphates and bimetallic phosphates. In this study, we have explored the iron zinc phosphate system and synthesized [Fe0.4Zn0.6PO4]2· [NH3CH2CH2NH3] (1). Compound 1 is a structural analogue with the zeolite DFT topology. To our knowledge, transition metal phosphates with zeolitic topologies are seldom in the literature. Here we report its synthesis and structure.

Synthesis of Aluminophosphate and Sodium Aluminophosphate Gels and Glasses

Synthesis of Aluminophosphate and Sodium Aluminophosphate Gels and Glasses

Towards rational design and synthesis of aluminophosphates with 2-D layer and 3-D open-framework structures

This work presents our current progress on the rational design and synthesis of aluminophosphates with 2-D layer and 3-D open-framework structures. For the design of theoretical structures, we take two ways, one is using building block construction strategy to construct new 2-D networks and 3-D open frameworks. The other is using computer modeling method to systematically enumerate the theoretical network structures. The templating abilities of various amines in the formation of 2-D network or 3-D open-framework aluminophosphates can be evaluated in terms of non-bonding interaction energies of the guest templates and the host inorganic networks or frameworks. This well assists in the rational synthesis of target materials, with the good examples as 2-D Al 3P 4O 16 3− anionic layers, and 3-D Al 4P 5O 19(OH) 2− open frameworks with structures analogous to AlPO–HDA (HDA: 1,6-hexanediamine). On the other hand, 3-D open framework can be rationally assembled by a lower-dimensional chain through incorporation of transition metal cations as illustrated by the successful synthesis of a 3-D open-framework nickel aluminophosphate [NiAlP 2O 8][C 2N 2H 9].

Synthesis of aluminophosphate and derived materials with the ZON structure-type

Materials with the ZON structure-type were synthesized between 120°C and 180°C from gels with the composition: v P 2O 5; w Al 2O 3; x SiO 2; y MeO; a (CH 3) 4NCl; b HF; c (HOCH 2CH 2) 2NH; 80H 2O. Diethanolamine was used as a pH modifier without templating effects. The crystallization of AlPO 4 materials needs the presence of F − anions which compensate the M(CH 3) 4N + cationic template. The calcined AlPO 4 is stable and adsorbs water but not n-hexane, the eight-membered ring of the framework aperture being probably too distorted. Pure SAPO materials could be obtained with silica by decreasing the amount of F − in the gel in order to allow the formation of negative framework charges by the Si↔P substitution. Nevertheless, sodalite-type SAPO is formed in the complete absence of F −. Co substituted easily for Al in the CoAPO-ZON, and the amount of F − necessary for the synthesis could be decreased to zero. No conditions were found for the preparation of a continuous series of materials with compositions between AlPO 4 and the completely substituted CoAPO. The substitution of Al by Zn was more difficult and no MgAPO-ZON could be obtained.

Crystal Structures of a Series of Novel Alkylammonium Phosphates and Their Formation in Aluminophosphate Synthesis Mixtures.

The crystal structures of several novel alkylammonium phosphate salts were determined by single-crystal X-ray methods: cyclopentylammonium monohydrogen phosphate (CMP) ([C(5)H(9)NH(3)(+)](2)[HPO(4)(2)(-)], monoclinic, space group P2(1)/n, Z = 4, a = 14.197(3) Å, b = 5.992(1) Å, c = 16.580(3) Å, beta = 98.57(2) degrees ); octylammonium dihydrogen phosphate (ODP) ([CH(3)(CH(2))(7)NH(3)(+)][H(2)PO(4)(-)], monoclinic, space group P2(1)/c, Z = 4, a = 4.554(1) Å, b = 34.652(3) Å, c = 7.328(1) Å, beta = 90.66(1) degrees ); and decylammonium dihydrogen phosphate (DDP) ([CH(3)(CH(2))(9)NH(3)(+)][H(2)PO(4)(-)], monoclinic, space group P2(1)/n, Z = 4, a = 7.358(2) Å, b = 39.749(12) Å, c = 9.131(4) Å, beta = 90.45(2) degrees ). Each are composed of anionic layers of hydrogen-bonded phosphate molecules, separated by charge-balancing alkylammonium cations. The long-chain alkylammoniums in ODP and DDP are interdigitated, while the cyclopentylammoniums in CMP define a bilayer-like arrangement. Large crystals were grown by recrystallization, but the materials were also observed to form in the corresponding solvothermal aluminophosphate synthesis mixtures. We have isolated phosphate salt compounds in aluminophosphate synthesis mixtures containing a variety of different alkylamines and suggest they are initially present in such experiments whenever the alkylamine is primary or secondary.

In-situ Investigation of Magnesium Aluminophosphate Synthesis by Synchrotron X-Ray Powder Diffraction.

In-situ Investigation of Magnesium Aluminophosphate Synthesis by Synchrotron X-Ray Powder Diffraction.

The synthesis and structure of two novel layered aluminophosphates containing interlamellar cyclohexylammonium

The synthesis of aluminophosphates from a nonaqueous tetraethylene glycol–cyclohexylamine medium yields two new layered materials that have been solved by single-crystal X-ray diffraction.