Thermochemical Study of Coordination of Holmium Chloride Hydrate with Diethylammonium Diethyldithiocarbamate  

作　　者：ZHAO Feng-qi CHEN San-ping JIAO Bao-juan REN Yi-xia GAO Sheng-li SHI Qi-zhen 

机构地区：[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

出　　处：《Chemical Research in Chinese Universities》2004年第6期766-770,共5页高等学校化学研究(英文版)

基　　金：the National Natural Science Foundation of China(No. 2 0 1710 36 ) and the Natural Science Foundation ofShaanxi Province(No.2 0 1710 36

摘　　要：The complex of holmium chloride hydrate with diethylammonium diethyldithiocarbamate(D-DDC) was synthesized via mixing their solutions in absolute alcohol under a dry N 2 atmosphere. The elemental and chemical analyses show that the complex has the general formula Et 2NH 2[Ho(S 2CNEt 2) 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 Et 2NH 2[Ho(S 2CNEt 2) 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.The complex of holmium chloride hydrate with diethylammonium diethyldithiocarbamate(D-DDC) was synthesized via mixing their solutions in absolute alcohol under a dry N 2 atmosphere. The elemental and chemical analyses show that the complex has the general formula Et 2NH 2[Ho(S 2CNEt 2) 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 Et 2NH 2[Ho(S 2CNEt 2) 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.

关 键 词：Holmium chloride hydrate Diethylammonium diethyldithiocarbamate(D-DDC) Microcalori-metric method THERMOCHEMISTRY 

分 类 号：O621[理学—有机化学]