Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

Enthalpies of formation of europium alkoxides: What lessons can be drawn from them

Branco, J. B.[Joaquim B.], Carretas, J. M.[Jose M.], Epple, M.[Matthias], Cruz, A.[Adelaide], Matos, A. P. d., Leal, J. P.[Joao Paulo]
J. Chem. Thermodyn. 2014, 75, 20-24
ABSTRACT
The synthesis and characterization of two europium alkoxides, Eu(OCH3)2 and Eu(OC2H5)2, were described. For the first time the enthalpies of formation of divalent lanthanide alkoxides were determined by using reaction-solution calorimetry. The values obtained are DfH0 [Eu(OCH3)2,cr] = 850.5 +- 5.0 kJ/ mol and DfH0 [Eu(OC2H5)2,cr] = 902.5 +- 5.5 kJ/mol, respectively. Since these compounds have a large use as catalysts or catalysts precursors, the first step of the reaction of them with CO2 was addressed, which permits to have an idea of the kind of bond involved in those compounds. Moreover, insertion of CO2 in the europium oxygen bond and formation of metal carboxylate complexes, is in both cases presumably bidentate.
Compounds
# Formula Name
1 Eu europium
2 H2 hydrogen
3 C graphite
4 O2 oxygen
5 C2H6EuO2 europium(II) methanolate
6 C4H10EuO2 europium(II) ethanolate
7 ClH hydrogen chloride
8 Cl3Eu europium(III) chloride
9 H2O water
Datasets
The table above is generated from the ThermoML associated json file (link above). POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied; the numbers refer to the table of compounds on the left.
Type Compound-# Property Variable Constraint Phase Method #Points
  • POMD
  • 7
  • 9
  • 8
  • Molar enthalpy of solution, kJ/mol ; Liquid
  • Solvent: Amount concentration (molarity), mol/dm3 - 7; Liquid
  • Pressure, kPa; Liquid
  • Temperature, K; Liquid
  • Mole fraction - 8; Liquid
  • Liquid
  • ISOPERIBOL
  • 1
  • RXND
  • 1
  • 6
  • 2
  • 3
  • 4
  • Molar enthalpy of reaction, kJ/mol
  • Solution calorimetry
  • 1
  • RXND
  • 1
  • 5
  • 2
  • 3
  • 4
  • Molar enthalpy of reaction, kJ/mol
  • Solution calorimetry
  • 1