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- W2070179987 abstract "Cinq hétéropolytungstates, de formules Na8[H6Sb2W21O73]·16,5 H2O, Na8[H6Sb2W21O73]·19 H2O, Na8[H6Bi2W21O73]·16,5 H2O, Li2Na6[H6Sb2W22O76]·14,5 H2O et Na5[H7Sb2NiW21O73(H2O)3]·20 H2O ont été synthétisés et étudiés par diffraction des rayons X. Les valeurs des facteurs de température isotropes de l’atome de tungstène externe et de ses trois atomes d’oxygène terminaux ont été comparées à celles des autres atomes de même type, d’une part au sein d’un même composé, d’autre part au sein de cette série de cinq composés. Cette analyse permet de conclure que le squelette lacunaire X2W21 (X = Sb,Bi) existe et qu’il peut être éventuellement rempli par un métal de transition, comme le nickel. Pour citer cet article : Y. Jeannin, C. R. Chimie 7 (2004). A novel vacant heteropolytungstate of skeleton X2W21 derived from the polytungstate [H6X2W22O76]8– (X = Sb,Bi). Five heteropolytungstates Na8[H6Sb2W21O73]·16.5 H2O, Na8[H6Sb2W21O73]·19 H2O, Na8[H6Bi2W21O73]·16.5 H2O, Li2Na6[H6Sb2W22O76]·14.5 H2O, and Na5[H7Sb2NiW21O73(H2O)3]·20 H2O were prepared and studied by X-ray diffraction. The values of isotropic temperature factors of the external tungsten atom and of its three terminal oxygen atoms were compared to those of same-type atoms, firstly of the same polytungstate, and secondly inside this five-compound family. This analysis led to the conclusion that the vacant assembly X2W21O73 (X = Sb,Bi) does exist and that the vacancy may be filled up with a first row transition metal such as nickel. To cite this article: Y. Jeannin, C. R. Chimie 7 (2004)." @default.
- W2070179987 created "2016-06-24" @default.
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- W2070179987 date "2004-12-01" @default.
- W2070179987 modified "2023-09-24" @default.
- W2070179987 title "Sur un nouvel hétéropolytungstate lacunaire à squelette X2W21 dérivé du polytungstate [H6X2W22O76]8– (X = Sb,Bi)" @default.
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- W2070179987 doi "https://doi.org/10.1016/j.crci.2004.05.007" @default.
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