Enthalpy of sublimation/vaporization of trans-cyclohexyl-1,4-diamine and cis-cyclohexyl-1,2-diamine
Tome, L. I. N.[Luciana I.N.], Rosado, M. T. S.[Mario T.S.], Nunes, S. C. C.[Sandra C.C.], Maria, T. M. R.[Teresa M. R.], Canotilho, J.[Joao], Eusebio, M. E.[M. Ermelinda]
The molar enthalpy of sublimation, Dg crH m, of trans-cyclohexyl-1,4-diamine and the molar enthalpy of vaporization, Dg l H m, of ciscyclohexyl- 1,2-diamine, at the temperature 298.15 K, were determined by calorimetry. Dg crH moT 1/4 298:15 KP 1/4 o105:0 0:8P kJ mol 1 was obtained for the trans-isomer and Dg l H moT 1/4 298:15 KP 1/4 o62:2 1:0P kJ mol 1 for the cis form. The molar enthalpy of fusion of the first compound, at T = 342.1 K, was determined by differential scanning calorimetry. The molar enthalpy of vaporization of the 1,4-isomer was estimated by combining the value of the enthalpy of sublimation with that of the enthalpy of fusion. The values obtained for molar standard enthalpy of vaporization and those available for the enthalpy of the diamines in the gas state were used to calculate the difference between the enthalpies of both compounds in the liquid state.
Compounds
#
Formula
Name
1
C6H14N2
cis-1,4-cyclohexanediamine
2
C6H14N2
trans-1,4-cyclohexanediamine
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
1
Molar enthalpy of vaporization or sublimation, kJ/mol ; Liquid
Temperature, K; Liquid
Liquid
Gas
Static calorimetry
1
POMD
2
Molar enthalpy of transition or fusion, kJ/mol ; Crystal
Crystal
Liquid
Air at 1 atmosphere
DSC
1
POMD
2
Normal melting temperature, K ; Crystal
Crystal
Liquid
Air at 1 atmosphere
DTA
1
POMD
2
Molar enthalpy of vaporization or sublimation, kJ/mol ; Crystal