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《南京师大学报（自然科学版）》[ISSN:1001-4616/CN:32-1239/N]

Issue:

2013年03期

Page:

48-52

Research Field:

化学

Publishing date:

Info

Title:

Synthesis and Characterization of Silanol Derivative of Keggin Tungstocobaltate[Co^ⅢW₁₁O₄₀(SiOH)₂]^5-

Author(s):

Zhang Jianping; Yang Chun

School of Chemistry and Materials Science,Nanjing Normal University,Nanjing 210097,China

Keywords:

tungstocobaltate; silanol substituted; Keggin structure; synthesis and characterization

PACS:

O611.4

DOI:

-

Abstract:

The Keggin-type silanol substituted tungstocobaltate[Co^ⅢW₁₁O₄₀(SiOH)₂]^5- was synthesized for the first time by using Co^ⅢW₁₁ and TEOS as start materials in an ethanol-water mixing solvent.The structure and composition of the products were characterized by IR,UV-vis,TG-DTA and elemental analysis techniques.The results showed that two Si atoms were inserted into the vacancy of Co^ⅢW₁₁ and a Si-O-Si bridge was formed between two Si atoms.The symmetry of the product is between saturated and vacant Keggin structure.Moreover,the effect of synthesis conditions on the product was also investigated.It is demonstrated that the pH and the volume ratio of ethanol to water greatly influence the yield and the purity of the product.A proper matching of acidity and ethanol dosage is necessary.The product with good yield and high purity was obtained under pH=1 and V_EtOH:V_H20=2:1.

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Memo

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Common functions

Last Update: 2013-09-30