A new polyoxometalate based on mono-lacunary Dawson polyoxoanion: molecular structure of [{Nd(H(2)O)(3)(alpha(2)-P(2)W(17)O(61))}(2)(14-)

作者：Bai Yan; Yang Dong; Wang Jingping; Niu Jingyang^*

来源：Journal of Rare Earths, 2008, 26(4): 478-482.

DOI：10.1016/S1002-0721(08)60122-2

• mono-lacunary polyoxometalate
• Dawson structure
• rare earths

A new polyoxometalate dimer based on lacunary Wells-Dawson anion and lanthanide cation, Na(14)[{Nd(H(2)O)(3) (alpha(2)-P(2)W(17)O(61))center dot 17H(2)O, was isolated as a sodium salt under ambient conditions and characterized by IR, TG, and X-ray single crystal structure analysis and electrochemistry. It belonged to the triclinic, space group P (i) over bar with a=1.26738 (15) nm, b=1.41464 (17) nm, C=2.3254 (4) nm, a=103.142 (2)degrees, beta = 95.122 (2)degrees, gamma=13.9690 (10)degrees, V=3.6317 (8)nm(3), Z=2, Dc=4.274 mg/m(3), and mu=27.695 nm(-1). The Nd(3+) ion was substituted for a [W=O](4+) unit in the "cap" site of the tungsten-oxygen framework of the parent Wells-Dawson ion. The cyclic voltammograms of the tide compound exhibited nearly chemically reversible one-step one-electron transfer process and two-step irreversible reduction processes. Thermogravimetric showed a one-step slow weight loss stage in the range of 25-850 degrees C.

• 出版日期2008-8
• 单位河南大学