Synthesis And Characterization Of Metal Phosphates And Phosphonates Microporous Materials

Inorganic microporous materials have popular application in catalysis, adsorption, ion-exchange, separation and host-guest assemblies due to their unique pore architectures. The rational design and synthesis of new microporous materials, as well as the development of new synthetic ways are becoming the topics of microporous chemistry. In the last decade, the synthesis of new materials that might combine the nanoporosity of zeolites with the magnetic and optical properties, electronic conductivity and ferroelectric of main group metal or transition metal phosphates have been reported in the literatures. Metal phosphates have been widely utilized in nonlinear optical materials, phosphors, sensors, heat-resistant, biocompatible materials catalysis and separation, as well as in environmental and advanced functional materials.Considering the functions of microporous materials and the synthesis conditions, we designed and synthesized several microporous materials based on phosphate and organic phosphonates by using hydrothermal or solvethermal conditions. We have synthesized Q-AlPO4-5 by in situ hydrothermal synthesis. 8-hydroxyquinoline was used as template, at the same time, the 8-hydroxyquinoline inside the channel coordinated with aluminum of framework to form new Al-O bonds to lead to notable optical properties.A series of multi-walled microporous rare earth phosphate nanomaterials have been synthesized by reacting of Re3+ with PO43-, which hydrolyzed slowly from butylphosphate in a mixed solution of water by facile hydrothermal treatment. Upon UV excitation, the characteristic luminescence of the f-f transitions is observed. The green and red upconversion emissions were observed excited by 980 nm radiation. A series of transitional metal diphosphonate (Co, Mn, Fe, Ni) with microporous has been synthesized by hydrothermal method. The cobalt compound can be stable up to 500 oC illustrating the exceptionally stability of the framework. The manganese and iron compound exhibit interesting metamagnet behavior due to spin canted antiferromagnetic with high critical temperature. When added 4, 4'-bpy, we got a novel layered nickel compound with organodiphosphonate/organoimine system, which could adsorb alkaline gas.We have succeeded in the synthesis of the novel lanthanide oxide nitride compounds Ln2O4(NO3)2/3(H3O)8/3 (Ln = Y, Tm, Lu, Yb) with a SOD topology and a 3-D M-O-M framework. The framework expands the original structure of SOD nanocage from 9 angstrom to 14 angstrom. These lanthanide oxide nitride compounds combine the common features of traditional zeolites and may generate a new kind of materials that combine the useful properties of zeolites and lanthanide. Two of lanthanide nitride (Ln = Tb, Gd) with a novel three dimensional structure have been prepared through hydrothermal method. The lanthanide ions are eight-coordinate with six oxygen atoms coming from nitrate ions and two bridge oxygen atoms. If the bridge oxygen atoms could be ignored, the compound can be described as a rare microporous 3D Lanthanide nitride with the open framwork.