SYNTHESES AND CHARACTERIZATION OF HETEROPOLY TUNGSTOSILICATE ISOMERS OF LANTHANIDE ELEMENTS

Chinese Journal of Applied Chemistry ›› 1992, Vol. 0 ›› Issue (2): 46-50.

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SYNTHESES AND CHARACTERIZATION OF HETEROPOLY TUNGSTOSILICATE ISOMERS OF LANTHANIDE ELEMENTS

Niu Zengyuan, Qu Lunyu, Chen Yaguang, Peng Jun, Liu Jingfu

Department of Chemistry, Northeast Normal University, Changchun 130024

Received:1991-02-11 Revised:1991-07-04 Published:1992-04-10 Online:1992-04-10

Abstract

Abstract: The isomers of K₁3[Ln(β_i-SiW₁₁O₃₉)₂·xH₂O (Ln=La, Ce, Pr, Nd, Sm, Gd, Er; β_i=β₁ and β₃) have been prepared and characterized by elemental analysis, polarography,CV, UV-VIS, magnetic susceptibility, magnetic moments determination and thermal analysis. It is showed that the polarographic half wave Potential E_1/2 for the new complexes are in the same order as for the β_i-SiW₁₁. In β-isomers the E(1/2) of β_i decreases with the increaoe of the number of unrotated W₃O₁₃ group.A linear relationship between E_1/2(Ⅰ)and the lowest energy of charge-transfer of the complexes is found. It can be concluded from VIS spectra that Ln(β_i-SiW₁₁)₂ and Ln(α-SiW₁₁)₂ have an identical geometric structure.

Key words: lanthanide elements, tungstosilicate heteropoly complex, isomer, synthesis

Niu Zengyuan, Qu Lunyu, Chen Yaguang, Peng Jun, Liu Jingfu. SYNTHESES AND CHARACTERIZATION OF HETEROPOLY TUNGSTOSILICATE ISOMERS OF LANTHANIDE ELEMENTS[J]. Chinese Journal of Applied Chemistry, 1992, 0(2): 46-50.

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SYNTHESES AND CHARACTERIZATION OF HETEROPOLY TUNGSTOSILICATE ISOMERS OF LANTHANIDE ELEMENTS

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