Synthesis And Characterization Of The Two Novel Phosphites

Inorganic microporous crystal materials have not only the potential applications in catalysis, ion exchange, absorption, molecular recognization, ion conductor, magnetic field, but also have great significance in crystallography and the study of biomineralization.For the past decades, people have been interested in synthesis and application of transition metal phosphate with open framework. And as we know, the structure of HPO₃²-is similar to that of PO₄³-, so HPO₃²- may act as the structure unit to build the open framework. Compared with the research on transition metal phosphate with open framework, the research on transition metal phosphate templated by organic amine is rare. So, in the past few years, people have become interested in the research on transition metal phosphite. Up to now, a lot of phosphite compounds with open framework have been synthesized, such as vanadium phosphite, chromium phosphite, manganese phosphite, iron phosphite, cobalt phosphite and zinc phosphite.Up to now, zinc phosphite play an important role among transition metal phosphite, since decades of zinc phosphite have been synthesized.Using metal cobalt and zinc as source materials, and piperazine as template, we first prepared the double metal phosphite (C₄H₈N₂H₄)[Zri_3-X Co_x(HPO₃)₄(H₂O)₂] (x=0.83) by hydrothermal treatment, which holds new composition and structure. The 3D framework of the compound is constructed by alternately linking MO₄ (M = Zn or Co) tetrahedron, ZnO₄(H₂O)₂ octahedron by sharing vertex of pseudo-tetrahedron HPO3. It is noted that the infinite chains...