Synthesis, Structure and Properties of Inverse-Keggin Potassium Tetraniobooctatungstosilicate

Chemical Research in Chinese Universities ›› 1997, Vol. 13 ›› Issue (3): 195-200.

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Synthesis, Structure and Properties of Inverse-Keggin Potassium Tetraniobooctatungstosilicate

YUE Bin¹, TANG Li-hao¹, RUI Cheng-guo¹, LIU Hui-zhang¹, JIN Song-lin¹, ZHU Si-san¹, LIU Jie², CHEN Min-yin²

1. Department of Chemistry, Fudan University, Shanghai 200433;
2. Center of Analysis and Measurement, Fudan University, Shanghai 200433

Received:1996-04-16 Online:1997-08-24 Published:2011-08-17
Supported by:
Supported by the National Natural Science Foundation of China.

Abstract

Abstract: Potassium tetraniobooccatungotosilicate, K₈[SiNb₄W₈O₄₀]·12H₂O was pre-pared by the reaction of white powdery tungstic acid, potassium niobate and potas -sium silicate in aqueous solution with pH value adjusted by potassium carbonate。The heteropolyniobotungstate crystallized in cubic space group P_m3m with unit cellparameters ;: a = 1.0640(1)nm,Z=1,V=1 .2045(5)nm³,R=0.055,R_w =0.062。The anion has inverse,Keggin structure,in which the central SiO₄ tetrahedron isdistributed statistically in two orientations。The twelve outer metal positions arerandomly occupied by four niobium and eight tungsten atoms. Moreover, infraredspectrat electronic :spectra and thermogram were measured。

Key words: Tetraniobooctatungstosilicate, Synthesis, Inverse -Keggin structure

YUE Bin, TANG Li-hao, RUI Cheng-guo, LIU Hui-zhang, JIN Song-lin, ZHU Si-san, LIU Jie, CHEN Min-yin . Synthesis, Structure and Properties of Inverse-Keggin Potassium Tetraniobooctatungstosilicate[J]. Chemical Research in Chinese Universities, 1997, 13(3): 195-200.

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Synthesis, Structure and Properties of Inverse-Keggin Potassium Tetraniobooctatungstosilicate

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