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- W2014930714 abstract "Abstract Two new tin(II) phosphate materials, three-dimensional [NH 4 ][Sn 4 (PO 4 ) 3 ] (compound I ) and layered [NH 4 ][SnPO 4 ] (compound II ), have been synthesized hydrothermally and their structures determined by single crystal X-ray diffraction. Both structures are made of pyramidal SnO 3 and tetrahedral PO 4 moieties and have the ammonium ion as the charge balancing species. Compound I is hexagonal: space group P 6 3 (#173), a =9.6975(3) and c =8.0938(3) A; V =659.18(4) A 3 , Z =6. The three-dimensional structure of I involves 6-, 8- and 12-membered rings. One-dimensional six-point star (SPS) channels of diameter 5.1 A occur along the c axis, in addition to tortuous narrower channel. Ammonium ions occupy the SPS channels and are hydrogen bonded to the framework oxygens. Compound II is monoclinic: space group P 2 1 / c (#14), a =6.5200(13), b =9.4794(19), c =8.0719(16) A and β =90.95(3)°; V =498.82(17) A 3 , Z =4. The layered structure is made of 4- and 8-membered rings which extend through the bc plane and these negatively charged layers are held together by the ammonium ions. Temperature-dependent X-ray diffraction studies on I from room temperature up to 800°C reveal the presence of three different phases. Preliminary results on the decomposition of 2-propanol over ( I ) treated at different temperatures have yielded insight into the acid–base properties of this novel material and their dependence upon activation conditions." @default.
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- W2014930714 date "2000-02-01" @default.
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- W2014930714 title "Synthesis, characterization and acid–base catalytic properties of ammonium-containing tin(II) phosphates: [NH4][Sn4P3O12] and [NH4][SnPO4]" @default.
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- W2014930714 doi "https://doi.org/10.1016/s1466-6049(99)00068-9" @default.
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