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  Global Journal of Physical Chemistry. Volume 2, Issue 3 (2011) pp. 294-301
  Research Article
 
Determination of standard molar enthalpies of formation of complexes involving rare earth chloride with glycine
  Wenjie Zhao a, Fei Liu b, Lijun Wang b, Fushan Yu b, Lingling Zhang b, Xuwu Yang b,*  
     
a Department of Biochemical Engineering, Xianyang Vocational Technical College, Xianyang, 712000, P. R. China
b Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, Shaanxi Key Laboratory of Physico-Inorganic Chemistry, College of Chemistry and Materials Science, Northwest University, Xi’an, 710069, P. R. China

   
  Abstract  
 

The constant-volume combustion energies, ΔcU, have been determined for 15 solid complexes of rare earth chloride with glycine by a precise rotating-bomb calorimeter. The standard molar enthalpies of combustion, ΔcHmΘ and standard molar enthalpies of formation, Δf HmΘ, at T = 298.15 K have been calculated for these complexes. The relationship of Δf HmΘ with the atomic numbers of the elements in the lanthanide series has been examined. The results show that a certain amount of covalence is present in the chemical bond between the rare earth and glycine. Furthermore, corresponding Δf HmΘ of Pm(Gly)3 Cl3 ·3H2O was estimated as -2698 kJ·mol -1.

     
  Keywords  
  Glycine; rare earth chloride; solid complexes; standard molar enthalpy of formation; precise rotating-bomb calorimeter  
     
   
   
   
   
     

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