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Type: Artigo de periódico
Title: The Mean Enthalpy Of The Lanthanide-oxygen Bond In 2,2,6,6-tetramethyl-3,5-heptanedione Chelates Of Praseodimium And Holmium
Author: Airoldi C.
Santos Jr. L.S.
Abstract: The general thermochemical reaction LnCl 3·6H 2O(c)+3Hthd(1)+73.92H 2O(1) = Ln(thd) 3(c) +3HCl·26.64H 2O(aq); ΔrHm (Ln = Pr, Ho and thd = 2,2,6,6-tetramethyl-3,5-heptanedionate) was employed to determine through solution-reaction calorimetry at 298.15 K the standard molar enthalpies of formation of crystalline chelates, -2434.3±11.5 (Pr) and -2384.8±11.5 (Ho) kJ mol -1. These values and the corresponding molar enthalpies of sublimation enabled the determination of the standard molar enthalpies of chelates in the gaseous phase. From these values the mean enthalpies of the lanthanide-oxygen bond, 265±10 (Pr) and 253±10 (Ho) kJ mol -1 were calculated. © 1993 Plenum Publishing Corporation.
Editor: Kluwer Academic Publishers
Rights: fechado
Identifier DOI: 10.1007/BF00681206
Date Issue: 1993
Appears in Collections:Unicamp - Artigos e Outros Documentos

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