A mixed-addenda Nb/W polyoxometalate containing dimeric Dawson subunit: Synthesis, structure, and characterization

作者：Ren Yuanhang; Hu Yichen; Shan Yucheng; Kong Zuping; Gu Min; Yue Bin^*; He Heyong

来源：Inorganic Chemistry Communications, 2014, 40: 108-111.

DOI：10.1016/j.inoche.2013.11.037

• Polyoxometalates
• Nb/W mixed-addenda
• Dawson type
• Dimeric unit

A mixed-addenda Nb/W polyoxometalates, K4Na4[H6P2W12Nb4O59(NbO2)(2)](2) center dot 48H(2)O (1), has been isolated under acidic condition. The single crystal structural analysis showed that the six vacant sites of the lacunary {P2W12} precursor are occupied by six Nb atoms, two at the polar sites and four at the equatorial sites to form a (P2W12Nb6} mixed-addenda subunit. Two (P2W12Nb6) 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 {P2W12} 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.

• 出版日期2014-2
• 单位复旦大学