Hybrid Open Frameworks. Hydrothermal Synthesis, Structure Determinations, and Magnetic Behavior of (VIVO)2(H2O){O3P–(CH2)3–PO3}⋅2H2O: A New Vanado-alkyldiphosphonate Closely Related to VO(HPO4)⋅0.5H2O

Author： Riou D.   Serre C.   Provost J.   Ferey G.  

Publisher： Academic Press

ISSN： 0022-4596

Source： Journal of Solid State Chemistry, Vol.155, Iss.1, 2000-11, pp. : 238-242

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Abstract

(VIVO)2(H2O) {O3P–(CH2)3–PO3}⋅2H2O was hydrothermally synthesized from a mixture of VOSO4⋅5H2O:H2PO3– (CH2)3–PO3H2:H2O in a molar ratio 1:0.5:250 and heated for 72 hours to 170°C. Its structure was determined from powder X-ray diffraction data. It crystallizes in the orthorhombic space group Immm (No. 71) with a=16.8210(5) Å, b=9.3790(3) Å, c=7.4568(2) Å, V=1176.4(1) Å3, Z=4. The pillared framework is built up from inorganic layers covalently linked via P–C–C–C–P bonds. The inorganic layers are similar to those encountered in a VO(HPO4)⋅0.5H2O bidimensional compound described previously. The dimers of face-shared VO5(H2O) octahedra are linked by PO3C phosphonate groups instead of PO3(OH) groups in the vanadyl hydrogenphosphate. The terminal hydroxyl groups in the latter are substituted by the carbons of the organic chains which link two layers, giving the three-dimensional character of the structure. The magnetic behaviors of the two compounds are compared.

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