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2005
Copper
I 7400
08- 023
Synthesis and Structure of the Pentacopper(II) Substituted Tungstosilicate
[Cu5(OH) 4(H2O) 2(A-α-SiW9O33)2]10-. — Compound (III) crystallizes in the triclinic
space group P1 with Z = 2 (single crystal XRD at 173 K). The title polyanion represents
the first polyoxotungstate substituted by five Cu centers and the central copper-hydroxo-aqua fragment is completely unprecedented. In the course of the reaction, two
[A-α-SiW9O34]10- Keggin half-units are fused in an asymmetrical fashion resulting in
the lacunary polyoxotungstate [Si2W18O66 ]16-. The vacancy in this species is stabilized
by a magnetic cluster of five octahedrally coordinated Cu2+ ions resulting in the
[Cu5(OH)4(H2O)2(SiW9O33)2]10- polyanion with C2v symmetry. — (BI, L.-H.;
KORTZ*, U.; Inorg. Chem. 43 (2004) 25, 7961-7962; Sch. Eng. Sci., Intern. Univ.
Bremen, D-28759 Bremen, Germany; Eng.) — Schramke
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