Journal
ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE
Volume 632, Issue 4, Pages 534-536Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/zaac.200500482
Keywords
heteropolytungstates; holmium; Keggin structure; polyoxometalates; tungsten
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The novel polyoxotungstate Na7K18[Ho-5(H2O)(16)(-)(OH)(2)As6W64O220] center dot 56 H2O (1) was synthesized in aqueous solution and characterized by X-ray structure analysis, elemental analysis and IR spectroscopy. The anion in I represents one of the largest polyoxoanions known yet and exhibits an unusual arrangement of six Keggin units. It consists of six trivacant lacunary alpha-beta-(AsW9O33)(9-) Keggin fragments which are connected by a bridging [Ho5W10(H2O)(16)(OH)(2)O-22](29+) unit. The five Ho-III atoms are coordinated by eight oxygen atoms, forming a square-antiprism.
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