The solid copper l-threonate hydrate, Cu(C4H6O5)*0.5H2O, was synthesized by the reaction of l-threonic acid with copper dihydrocarbonate and characterized by means of chemical and elemental analyses, IR and TG-DTG. Low-temperature heat-capacity of the title compound has been precisely measured with a small sample precise automated adiabatic calorimeter over the temperature range from 77 to 390 K. An obvious process of the dehydration occurred in the temperature range between 353 and 370 K. The peak temperature of the dehydration of the compound has been observed to be 369.304+-0.208K by means of the heat-capacity measurements. The molar enthalpy, ?dHm, of the dehydration of the resulting compound was of 16.490+-0.063 kJ mol-1. The experimental molar heat capacities of the solid from 77 to 353K and the solid from 370 to 390K have been, respectively, fitted to tow polynomial equations with the reduced temperatures by least square method. The constant-volume energy of combustion of the compound, ?cUm, has been determined as being -1616.15+-0.72 kJ mol-1 by an RBC-II precision rotating-bomb combustion calorimeter at 298.15 K. The standard molar enthalpy of formation of the compound, ?fH.m, has been calculated to be -1114.76+-0.81 kJ mol-1 from the combination of the data of standard molar enthalpy of combustion of the compound with other auxiliary thermodynamic quantities.
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
5
Molar heat capacity at constant pressure, J/K/mol ; Crystal