کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1507184 1511011 2006 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Divalent metal incorporation in MIL-74, the super-sodalite aluminum phosphates M3M3Al6(PO4)12⋅4tren⋅17H2O (M  =Mg, Mn, Co) and its gallium phosphate analogs M3′Ga6(PO4)12⋅4tren⋅17H2O (M′=M′=Mg, Mn, Co, Fe, Zn)
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Divalent metal incorporation in MIL-74, the super-sodalite aluminum phosphates M3M3Al6(PO4)12⋅4tren⋅17H2O (M  =Mg, Mn, Co) and its gallium phosphate analogs M3′Ga6(PO4)12⋅4tren⋅17H2O (M′=M′=Mg, Mn, Co, Fe, Zn)
چکیده انگلیسی

The mixed metal(II)–aluminum phosphates M3M3Al6(PO4)12⋅4tren⋅17H2O (M=Mg2+, Mn2+, Co2+) and its gallium phosphate analogs M3′Ga6(PO4)12⋅4tren⋅17H2O (M′=M′=Mg2+, Mn2+, Fe2+, Co2+, Zn2+) have been hydrothermally synthesized with the tris(2-aminoethyl)amine (tren  ) as a structure-directing agent (453 K, 36 hours, autogenous pressure). The solids were characterized by single-crystal X-ray diffraction. Their crystal structures are cubic, a≈16.8 Åa≈16.8 Å and may be described in I-43m. The open-framework is built up from an enneameric unit (T  =Al or Ga / Mg, Mn, Fe, Co, Zn) containing five TO4TO4 and four PO4 tetrahedra (one of the PO bonding is terminal). A central TO4TO4 tetrahedral unit shares all the corners with four phosphate groups. Two phosphate groups are connected to two other peripheral TO4TO4 units. It results in the formation of a “pseudo” planar building block T5P4T5P4 consisting of four square 4-rings. The connection of the T5P4T5P4 units generates a three-dimensional framework, which defines a super-sodalite topology. The resulting cavities (diameter of 10 Å) are bound by 12-ring windows in which are located the tren species in interaction with the phosphate groups (mainly terminal PO bonding) through hydrogen bond. A (H2O)17 cluster is encapsulated in the super-sodalite cages. The TO distances are discussed according to the ionic radii of the trivalent cations (Al, Ga) and the different divalent cations (Mg, Mn, Fe, Co, Zn).

Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solid State Sciences - Volume 8, Issues 3–4, March–April 2006, Pages 346–352
نویسندگان
, , , ,