Studies on the M(Ⅲ)X(V)O4-Type Microporous Crystals——The Syntheses and Structures of Microporous Gallophosphates

Abstract

Abstract: Anew family of microporous gallophosphates (namely GaPO₄-C_a, n= 1～12) was crystallized in (0.5～3)R.Ga₂O₃.(1～1.5)P₂O₅.(25～100)H₂O systems hydrothermally at 150～200℃ by using various amines and quarternary ammoniums as the templates(R) and characterized by means of chemical composition analysis, XRD, DTA-TG and NMR techniques. Their absorption properties were investigated by the measurements of water adsorption isotherms and adsorption capacities of "plug gauge" molecules with known diameters, as a result, the pore sizes of GaPO₄-C_a change from 3 to 6 Å. Three members of microporous gallophosphates were structurally determined by means of single crystal X-ray diffraction,these include GaPO₄-C₃,-C₄,-C₇. Some characteristics related to the structures such as coordination state of Ga, framework window and role of the template in the framework were discussed in more detail.

Key words: Microporous crystal, Gallophosphate, Syntheses, Structure

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Xu Ru-ren, Feng Shou-hua . Studies on the M(Ⅲ)X(V)O₄-Type Microporous Crystals——The Syntheses and Structures of Microporous Gallophosphates[J]. Chem. J. Chinese Universities, 1990, 11(12): 1335.

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Studies on the M(Ⅲ)X(V)O₄-Type Microporous Crystals——The Syntheses and Structures of Microporous Gallophosphates

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