| Autor: |
Zuping Kong, Yichen Hu, Min Gu, Bin Yue, Yuanhang Ren, Yucheng Shan, Heyong He |
| Rok vydání: |
2014 |
| Předmět: |
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| Zdroj: |
Inorganic Chemistry Communications. 40:108-111 |
| ISSN: |
1387-7003 |
| Popis: |
A mixed-addenda Nb/W polyoxometalates, K 4 Na 4 [H 6 P 2 W 12 Nb 4 O 59 (NbO 2 ) 2 ] 2 · 48H 2 O ( 1 ), has been isolated under acidic condition. The single crystal structural analysis showed that the six vacant sites of the lacunary {P 2 W 12 } precursor are occupied by six Nb atoms, two at the polar sites and four at the equatorial sites to form a {P 2 W 12 Nb 6 } mixed-addenda subunit. Two {P 2 W 12 Nb 6 } subunits are joined together in an inversion mode by two Nb–O–Nb bridges from the Nb atoms at equatorial sites to form a dimeric unit, which can be considered as a Nb 12 core wrapped by two lacunary {P 2 W 12 } polyoxoanions. It is notable that the terminal peroxo groups bonded niobium atoms in the Nb 12 core are only partially eliminated during the formation of the dimeric unit. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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