[Ho5(H2O)16(OH)2As6W64O220]25−, ein großes neuartiges Polyoxoanion aus trivakanten Keggin‐Fragmenten
[Ho5(H2O)16(OH)2As6W64O220]25−, ein großes neuartiges Polyoxoanion aus trivakanten Keggin‐Fragmenten
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DOI:
10.1002/zaac.200500482
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发表时间:
2006-03
期刊:
影响因子:
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通讯作者:
D. Drewes;M. Piepenbrink;B. Krebs
中科院分区:
文献类型:
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作者:
D. Drewes;M. Piepenbrink;B. Krebs
[Ho5(H2O)16(OH)2As6W64O220]25−, a Large Novel Polyoxoanion from Trivacant Keggin Fragments The novel polyoxotungstate Na7K18[Ho5(H2O)16(OH)2As6W64O220] · 56 H2O (1) was synthesized in aqueous solution and characterized by X-ray structure analysis, elemental analysis and IR spectroscopy. The anion in 1 represents one of the largest polyoxoanions known yet and exhibits an unusual arrangement of six Keggin units. It consists of six trivacant lacunary α-B-(AsW9O33)9− Keggin fragments which are connected by a bridging [Ho5W10(H2O)16(OH)2O22]29+ unit. The five HoIII atoms are coordinated by eight oxygen atoms, forming a square-antiprism.