MnGaPO-2: Synthesis and Characterization of MnGa(PO3OH)2(PO4)[C6N 2H14], a New Microporous Manganese-Gallium Phosphate

Ann M. Chippindale, Andrew D. Bond, Andrew R. Cowley, Anthony V. Powell

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Abstract

A new open-framework manganese-gallium phosphate has been synthesized under solvothermal conditions and characterized by single-crystal XRD, thermogravimetric analysis, and magnetic susceptibility measurements [crystal data: [MnGa(PO3OH)2(PO4)][C6N 2H14], Mr = 525.76, monoclinic, space group P21/n (No. 14), a = 10.193(1), b = 14.276(1), and c = 10.380 (1) Å, ß = 91.184(8)°, V = 1510 Å3, Z = 4, R = 5.8%, Rw = 7.8% (2331 observed data with I > 3s(I))]. The structure consists of MnO5, GaO4, and PO4 units linked to form a three-dimensional microporous framework encapsulating 1,4-diazabicyclo[2.2.2]octane cations. The Mn2+ ions have distorted square-pyramidal geometry and exist in Mn2(HPO4)4 units within the framework. Antiferromagnetic ordering at TN = 10(1) K is ascribed to coupling between Mn2+ ions in these subunits, and the temperature dependence of the susceptibility can be successfully fitted assuming a Heisenberg exchange interaction (J = -2.07(1) cm-1, g = 2.25(1)). At higher temperatures (>70 K) Curie-Weiss paramagnetism is observed (? = -20.2(2) K, µeff = 6.69(1)µB).

Original languageEnglish
Pages (from-to)2830-2835
Number of pages6
JournalChemistry of Materials
Volume9
Issue number12
Publication statusPublished - Dec 1997

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    Chippindale, A. M., Bond, A. D., Cowley, A. R., & Powell, A. V. (1997). MnGaPO-2: Synthesis and Characterization of MnGa(PO3OH)2(PO4)[C6N 2H14], a New Microporous Manganese-Gallium Phosphate. Chemistry of Materials, 9(12), 2830-2835.