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|Type:||Artigo de periódico|
|Title:||Calorimetric study of ethyleneurea, ethylenethiourea and propyleneurea cadmium chloride adducts|
|Author:||de Farias, RF|
|Abstract:||Adducts of the general formula CdCl2. nL [n = 1 and 2; L = ethyleneurea (eu), ethylenethiourea (etu) and propyleneurea (pu)] were synthesized by a solid state route and characterized by elemental analysis, infrared spectroscopy, and reaction solution calorimetry. The infrared results showed that eu and pu coordinate through carbonylic oxygen atoms, whereas etu uses the nitrogen as coordinating site. The standard molar reaction enthalpy in condensed phase: CdCl2(c) + nL(c) = CdCl2. nL(c); Delta H-r(m)0, were obtained from reaction-solution calorimetry, to give the following values for mono and bisadducts: -20.0 +/- 0.1; -19.9 +/- 0.1; -13.3 +/- 0.1 and -38.6 +/- 0.1; -56.9 +/- 0.1; -17.0 +/- 0.1 kJ mol(-1) for eu, etu and pu, respectively. The values of decomposition (Delta H-D(m)theta) and lattice enthalpy (Delta H-M(m)theta) as well as the mean cadmium-ligand bond dissociation enthalpy, D (Cd-L), were calculated for all adducts. (C) 2001 Elsevier Science B.V. All rights reserved.|
|Editor:||Elsevier Science Bv|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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