Sandwich-type phosphotungstates:: Structure, electrochemistry, and magnetism of the trinickel-substituted polyoxoanion [Ni3Na(H2O)2(PW9O34)2]11-

被引：95

作者：

Kortz, U

Mbomekalle, IM

Keita, B

Nadjo, L

Berthet, P

机构：

[1] Amer Univ Beirut, Dept Chem, Beirut 11072020, Lebanon

[2] Univ Paris 11, Chim Phys Lab, CNRS, UMR 800, F-91405 Orsay, France

[3] Univ Paris 11, CNRS, UMR 8648, Lab Physicochim Etat Solide, F-91405 Orsay, France

来源：

INORGANIC CHEMISTRY | 2002年 / 41卷 / 24期

关键词：

D O I：

10.1021/ic0255353

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The novel nickel-substituted, dimeric phosphotungstate [Ni3Na(H2O)(2)(PW9O34)(2)](11-) (1) has been synthesized and characterized by IR spectroscopy, elemental analysis, and electrochemistry. X-ray single-crystal analysis was carried out on Na-11[Ni3Na(H2O)(2)(PW9O34)(2)].21.25H(2)O, which crystallizes in the triclinic system, space group P (1) over bar, with a = 12.2467(6) Angstrom, b = 16.6031(7) Angstrom, c = 22.4017(12) Angstrom, alpha = 73.9870(10)degrees, beta = 87.6060(10)degrees, gamma = 79.344(2)degrees, and Z = 2. The polyanion consists of two lacunary B-alpha-[PW9O34](9-) Keggin moieties linked via three nickel(II) centers and a sodium ion. The structure of 1 is composed of two fused Keggin fragments that represent different Baker-Figgis isomers (alpha- vs beta-type). Electrochemical studies show that 1 exhibits a stable and reproducible voltammetric pattern, with a first wave featuring a chemically reversible four-electron/four-proton process, An investigation of the magnetic properties indicates that the three nickel centers exhibit ferromagnetic exchange interaction.

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页码：6412 / 6416

页数：5

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