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Chemical Research in Chinese Universities ›› 2004, Vol. 20 ›› Issue (6): 766-770.

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Thermochemical Study of Coordination of Holmium Chloride Hydrate with Diethylammonium Diethyldithiocarbamate

ZHAO Feng-qi1,2, CHEN San-ping1, JIAO Bao-juan1, REN Yi-xia1, GAO Sheng-li1, SHI Qi-zhen1   

  1. 1. Department of Chemistry, Shaanxi Key Laboratory of Physico-Inorganic Chemistry, Northwest University, Xi′an 710069, P. R. China;
    2. Xi′an Modern Chemistry Research Institute, Xi′an 710065, P. R. China
  • Received:2003-09-24 Online:2004-12-24 Published:2011-08-06
  • Supported by:

    Supported by the National Natural Science Foundation of China(No.20171036) and the Natural Science Foundation of Shaanxi Province(No.20171036).

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Abstract: The complex of holmium chloride hydrate with diethylammonium diethyldithiocarbamate(D-DDC) was synthesized via mixing their solutions in absolute alcohol under a dry N2 atmosphere. The elemental and chemical analyses show that the complex has the general formula Et2NH2[Ho(S2CNEt2)4]. It was also characterized by IR spectroscopy. The enthalpies of the dissolution of holmium chloride hydrate and D-DDC in absolute alcohol at 298.15 K, and the enthalpy changes of liquid-phase reactions of the formation of Et2NH2[Ho(S2CNEt2)4] at different temperatures were determined by microcalorimetry. On the basis of experimental and calculated results, three thermodynamic parameters(the activation enthalpy, the activation entropy and the activation free energy), the rate constant and three kinetic parameters(the apparent activation energy, the pre-exponential constant and the reaction order) of the liquid-phase reaction of the complex formation were obtained. The enthalpy change of the solid-phase complex formation reaction at 298.15 K was calculated by means of a thermochemical cycle.

Key words: Holmium chloride hydrate, Diethylammonium diethyldithiocarbamate(D-DDC), Microcalori-metric method, Thermochemistry