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2005
Tungsten
I 5700
21- 025
Cation-Directed Synthesis of Tungstosilicates. Part 2. Synthesis, Structure, and
Characterization of the Open Wells—Dawson Anion α-[{K(H2O)2}(Si2W18O66)]15and Its Transition-Metal Derivatives [{M(H2O)}(µ-H 2O)2K(Si2W18O66)]13- and
[{M(H2O)}(µ-H2O)2K{M(H2O)4}(Si2W18O66)] 11-. — The α-[{K(H2O)2}(Si2W18 O66)]15dimer is characterized by polarography and 183W NMR spectroscopy. Nine resonance
signals are observed for (III) in DMF/MeCN solution in agreement with the crystal
structure of the anion which consists of two A-α-[SiW9O34]10- units associated through
two W—O—W junctions. This anion derives from the Wells-Dawson structure by
breaking four W—O—W junctions. The pocket between the two half-anions can be
filled by several metal cations. Reaction with transition metal cations leads to the formation of complexes (V) and (VII). In the supporting information, single crystal XRD
data are given for (II) and (Vb, c) crystallizing in the triclinic space group P1 (Z = 2)
and for the monoclinic compounds (VII) (space group P21/n, Z = 4). —
(LECLERC-LARONZE, N.; MARROT, J.; HERVE*, G.; Inorg. Chem. 44 (2005) 5,
1275-1281; Inst. Lavoisier, CNRS, Univ. Versailles St. Quentin, F-78035 Versailles,
Fr.; Eng.) — Schramke
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