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Tytuł:
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Hydrothermal syntheses and structural characterization of two sandwich-type arsenotungstates.
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Autorzy:
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Chen, Lijuan
Fan, Yanhua
Zhao, Junwei
Ma, Pengtao
Shi, Dongying
Wang, Jingping
Niu, Jingyang
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Temat:
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ORGANIC compounds
INORGANIC compounds
COMPOSITE materials
TUNGSTATES
ANIONS
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Źródło:
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Journal of Coordination Chemistry; Jun2010, Vol. 63 Issue 12, p2042-2055, 14p, 7 Diagrams, 2 Charts, 1 Graph
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Two new organic-inorganic composite sandwich-type arsenotungstates [H2dap]6H8[Ni4(H2O)2(B-α-AsW9O34)2]2 · 33H2O (1) and {[Ni(dap)2(H2O)]2[Ni(dap)2]2[Ni4(Hdap)2(B-α-AsW9O34)2]} · 4H2O (2) (dap = 1,2-diaminopropane) have been hydrothermally synthesized by reaction of Na8[A-α-HAsW9O34] · 11H2O with NiCl2 · 6H2O in the presence of 1,2-diaminopropane and characterized by elemental analysis, IR spectra, X-ray single-crystal diffraction, and thermogravimetric analysis. 1 crystallizes in the triclinic P1 space group with a = 16.351(6) Å, b = 16.423(6) Å, c = 19.894(7) Å, α = 110.630(6)°, β = 92.684(7)°, γ =104.946(7)°, V = 4774(3) Å3, Z = 1, GOOF = 1.033, R1 = 0.0517, wR2 = 0.1086. 2 also crystallizes in the triclinic P1 space group with a = 13.305(4) Å, b = 13.882(4) Å, c = 17.031(5) Å, α = 68.109(5)°, β = 71.511(4)°, γ = 88.407(5)°, V = 2753.5(14) Å3, Z = 1, GOOF = 1.051, R1 = 0.0491, wR2 = 0.1150. Notably, 1 is a discrete structure, composed of two tetra-NiII substituted sandwich-type polyoxoanions [Ni4(H2O)2(B-α-AsW9O34)2]10- with different spatial orientation, whereas 2 displays a organic-inorganic composite 2-D sheet architecture constructed by tetra-NiII sandwiched [Ni4(H2O)2(B-α-AsW9O34)2]10- units by means of [Ni(dap)2]2+ bridges. Some previously reported transition-metal-substituted sandwich-type polyoxotungstates have been summarized. [ABSTRACT FROM AUTHOR]
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