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Chemical Research in Chinese Universities ›› 1988, Vol. 4 ›› Issue (2): 8-11.

• Articles • Previous Articles     Next Articles

A Study on Thermal Decomposition of K3[Fe(CN)6] and KFe[Fe(CN)6] in Helium

Chen Hanwen, Xin Xinquan, Niu Junning, Dai Anbang(A. P. Tai), Wang Xin, Zhang Yuchang   

  1. Nanjing University, Nanjing
  • Received:1987-10-15 Online:1988-04-24 Published:2011-09-09

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Abstract: K3 [Fe(CN)6] and KFe[Fe(CN)6] are classical coordination compounds. However, the mechanism of decomposition reactions has not been well expounded. The gas products of thermal decomposition were examined by gas chroma tography (GC), and the structure of the solid products by Mossbauer spectroscopy(MS) and X-ray diffraction(XRD). The findings are explained in terms of the theory of coordination chemistry and a decomposition mechanism is proposed in this study. On the basis of various experimental results, the first stage of the decomposition of K3[Fe(CN)6] in He was found to be the evolution of(CN)2 resulting in the reduction of Fe(Ⅲ):12K3 [Fe(CN)6]→9K4[Fe(CN)6] + Fe2[Fe(CN)6] + 6 ( CN)2 For KFe [Fe(CN)6], the first stage of decomposition man be represented as 6KFe[Fe(CN)6]→3K2Fe[Fe(CN)6] + 2Fe2[Fe(CN)6 + 3(CN)2 At higher temperatures, the decomposition of both K3[Fe(CN)6) and KFe[Fe(CN)6] to form KCN and Fe2C was accomplished by the release of(CN)2 and N2.

Key words: Thermal decomposition, K3[Fe(CN)6], KFe[Fe(CN)6]