Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/73615
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, LS
Abstract: The general thermochemical reaction LnCl3 . 6H2O(c) + 3Hthd(l) + 73.92H2O(l) = Ln(thd)3(c) + 3HCl . 26.64H2O(aq); DELTArHm (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.
Subject: THERMOCHEMISTRY
2,2,6,6-TETRAMETHYL-3,5-HEPTANEDIONE
MEAN ENTHALPY
BETA-DIKETONATES
LANTHANIDE ELEMENTS
LANTHANIDE OXYGEN BOND
Editor: Plenum Publ Corp
Rights: fechado
Identifier DOI: 10.1007/BF00681206
Date Issue: 1993
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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