Thermodynamics Research Center / ThermoML | Thermochimica Acta

Synthesis, heat capacity and enthalpy of formation of [Ho2(l-Glu)2(H2O)8](ClO4)4*H2O

Wu, X.-M.[Xin-Min], Tan, Z.-C.[Zhi-Cheng], Lu, X.-C.[Xue-Chuan], Qu, S.-S.[Song-Sheng]
Thermochim. Acta 2006, 441, 2, 199-202
ABSTRACT
A complex of holmium perchlorate coordinated with l-glutamic acid, [Ho2(l-Glu)2(H2O)8](ClO4)4*H2O, was prepared with a purity of 98.96%. The compound was characterized by chemical, elemental and thermal analysis. Heat capacities of the compound were determined by automated adiabatic calorimetry from 78 to 370 K. The dehydration temperature is 350 K. The dehydration enthalpy and entropy are 16.34 kJ mol-1 and 16.67 JK-1 mol-1, respectively. The standard enthalpy of formation is -6474.6 kJ mol-1 from reaction calorimetry at 298.15 K.
Compounds
# Formula Name
1 C5H9NO4 L-glutamic acid
2 ClHO4 perchloric acid
3 ClNa sodium chloride
4 ClH2NaO5 sodium perchlorate monohydrate
5 H2O water
6 C10H34Cl4Ho2N2O33 diholmium tetraperchlorate bis-l-glutamate nonahydrate
7 Cl3H12HoO6 holmium (III) chloride hexahydrate
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
  • 6
  • Molar heat capacity at constant pressure, J/K/mol ; Crystal
  • Temperature, K; Crystal
  • Pressure, kPa; Crystal
  • Crystal
  • Small (less than 1 g) adiabatic calorimetry
  • 76
  • RXND
  • 1
  • 2
  • 3
  • 4
  • 7
  • 6
  • 5
  • Molar enthalpy of reaction, kJ/mol
  • Solution calorimetry
  • 1