STANDARD MOLAR ENTHALPY OF FORMATION OF BIS(2,2,6,6-TETRAMETHYLHEPTANE-3,5-DIONATO) DIOXOURANIUM(VI) IN THE CRYSTALLINE AND GASEOUS STATES - THE MEAN U-O BOND-DISSOCIATION ENTHALPY

• Tipo: Artigo em Revista Científica Internacional
• Data: 1993

Autores

DASILVA, MAVR (Autor) FCUP; MONTE, MJS (Autor) FCUP; GIERA, E (Autor) Outra; KAKOLOWICZ, W (Autor) Outra

Revista

Título: Journal of Chemical Thermodynamics

Vol. 25

Páginas: 1263-1272

ISSN: 0021-9614

Editora: Elsevier

Indexação

ISI Web of Knowledge - 5 Citações

Scopus - 8 Citações

Classificação Científica

FOS: Ciências da engenharia e tecnologias > Engenharia mecânica

Outras Informações

ID Authenticus: P-001-MKY

DOI: 10.1006/jcht.1993.1125

Abstract (EN): The standard (po = 0.1 MPa) molar enthalpy of formation, at the temperature 298.15 K, of crystalline bis(2,2,6,6-tetramethylheptane-3,5-dionato) dioxouranium(VI) {uranyl(VI) dipivaloylmethanate, UO2(DPM)2}, was determined by solution-reaction calorimetry as -(2169.9±7.6) kJ·mol-1. The vapour pressure of the crystal, as function of the temperature, was measured using the Knudsen mass-loss effusion technique and the standard molar enthalpy of sublimation, at the temperature 298.15 K, was derived as (156.9±1.9) kJ·mol-1. From these results, the standard molar enthalpy of formation of the complex, in the gaseous state, was derived and the mean uranium(VI)-oxygen bond-dissociation enthalpy for the binding of the ligand to the metal, ¿D¿(U-O), was calculated as (223±10) kJ·mol-1.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 10