共 65 条
Alpha and beta isomers of tetrahafnium(IV) containing decatungstosilicates, [Hf4(OH)6(CH3COO)2(x-SiW10O37)2]12- (x = α, β)
被引:23
作者:

Assran, Awatef S.
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Jacobs Univ, Sch Engn & Sci, D-28725 Bremen, Germany
S Valley Univ, Fac Sci Qena, Dept Chem, Qena 83523, Egypt Jacobs Univ, Sch Engn & Sci, D-28725 Bremen, Germany

Mal, Sib Sankar
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Jacobs Univ, Sch Engn & Sci, D-28725 Bremen, Germany
Univ Ottawa, Ctr Catalysis Res & Innovat, Dept Chem, Ottawa, ON K1N 6N5, Canada Jacobs Univ, Sch Engn & Sci, D-28725 Bremen, Germany

Izarova, Natalya V.
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Jacobs Univ, Sch Engn & Sci, D-28725 Bremen, Germany Jacobs Univ, Sch Engn & Sci, D-28725 Bremen, Germany

Banerjee, Abhishek
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Jacobs Univ, Sch Engn & Sci, D-28725 Bremen, Germany Jacobs Univ, Sch Engn & Sci, D-28725 Bremen, Germany

Suchopar, Andreas
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Jacobs Univ, Sch Engn & Sci, D-28725 Bremen, Germany Jacobs Univ, Sch Engn & Sci, D-28725 Bremen, Germany

Sadakane, Masahiro
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Hiroshima Univ, Grad Sch Engn, Higashihiroshima 7398527, Japan Jacobs Univ, Sch Engn & Sci, D-28725 Bremen, Germany

Kortz, Ulrich
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h-index: 0
机构:
Jacobs Univ, Sch Engn & Sci, D-28725 Bremen, Germany Jacobs Univ, Sch Engn & Sci, D-28725 Bremen, Germany
机构:
[1] Jacobs Univ, Sch Engn & Sci, D-28725 Bremen, Germany
[2] Hiroshima Univ, Grad Sch Engn, Higashihiroshima 7398527, Japan
[3] S Valley Univ, Fac Sci Qena, Dept Chem, Qena 83523, Egypt
[4] Univ Ottawa, Ctr Catalysis Res & Innovat, Dept Chem, Ottawa, ON K1N 6N5, Canada
关键词:
VIBRATIONAL INVESTIGATIONS;
CRYSTAL-STRUCTURE;
ZR-IV;
HF-IV;
KEGGIN;
COMPLEXES;
DAWSON;
ZIRCONIUM;
OXIDATION;
POLYOXOMETALATE;
D O I:
10.1039/c0dt01543a
中图分类号:
O61 [无机化学];
学科分类号:
070301 ;
081704 ;
摘要:
The two dimeric, Hf-containing tungstosilicates [Hf-4(OH)(6)(CH3COO)(2)(alpha-SiW10O37)(2)](12)- (1) and [Hf-4(OH)(6)(CH3COO)(2)(beta-SiW10O37)(2)](12-) (2) have been synthesized by reacting HfCl4 with [gamma-SiW10O36](8-) in potassium acetate solutions at pH = 3.6 and 4.8, respectively. Polyanions 1 and 2 comprise a tetrahafnium(IV) assembly {Hf-4(OH)(6)(CH3COO)(2)} sandwiched between two dilacunary [alpha-SiW10O36](8-) (in 1) or {beta-SiW10} (in 2) Keggin type decatungstosilicates. This implies that the starting precursor {gamma-SiW10} isomerizes in situ to [beta-SiW10O37](10-) and then to [alpha-SiW10O37](10-) by controlled variation of pH and temperature. The hydrated potassium salts of 1 and 2 were investigated in the solid state by single-crystal XRD, FT-IR, thermogravimetric and elemental analyses, and in solution by UV-Vis and W-183 NMR spectroscopy, and electrochemistry.
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页码:2920 / 2925
页数:6
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