Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

Thermochemistry on crystalline compounds bis-(n-dodecylammonium) tetrachlorometallates (n-C12H25NH3)2MCl4(s) (M = Cu and Cd)

Zhong, W.-W.[Wen-Wen], Di, Y.-Y.[You-Ying], Tan, Z.-C.[Zhi-Cheng], Dou, J.-M.[Jian-Min]
J. Chem. Thermodyn. 2013, 66, 116-122
ABSTRACT
Crystalline bis-(n-dodecylammonium) tetrachlorocuprate (n-C12H25NH3)2CuCl4(s) and bis-(n-dodecylammonium) tetrachlorocadmate (n-C12H25NH3)2CdCl4(s) were synthesized. Chemical analysis, elemental analysis and X-ray crystallography were applied to characterise the compositions and crystal structures of the two complexes. In accordance with Hess law, two thermochemical cycles were designed, and the enthalpy changes of the reactions of n-dodecylammonium hydrochloride with CuCl2 2H2O(s) and CdCl2- 2.5H2O(s) were determined as DrHo m;1 = (32.86 +- 0.40) kJ mol 1 and DrHo m;2 = (5.28 +- 0.38) kJ mol 1 by an isoperibol solution-reaction calorimeter, respectively. Eventually, the standard molar enthalpies of formation of the title compounds were derived to be DfHo m [(n-C12H25NH3)2CuCl4, s] = (1630.4 +- 8.0) kJ mol 1 and DfHo m [(n-C12H25NH3)2CdCl4, s] = (1836.2 +- 8.0) kJ mol 1, respectively.
Compounds
# Formula Name
1 H2O water
2 Cu copper
3 Cl2 chlorine
4 H2 hydrogen
5 N2 nitrogen
6 C graphite
7 Cd cadmium
8 C24H56CdCl4N2 bis(n-dodecylammonium) tetrachlorocadmate
9 C24H56Cl4CuN2 bis(dodecylammonium) tetrachlorocuprate(II)
10 Cl2CuH4O2 copper(2+) chloride dihydrate
11 Cd2Cl4H10O5 cadmium chloride (CdCl2), hydrate (2:5)
12 C12H28ClN dodecanamine hydrochloride
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
  • 8
  • Mass density, kg/m3 ; Crystal
  • Temperature, K; Crystal
  • Pressure, kPa; Crystal
  • Crystal
  • X-ray diffraction
  • 1
  • POMD
  • 9
  • Mass density, kg/m3 ; Crystal
  • Temperature, K; Crystal
  • Pressure, kPa; Crystal
  • Crystal
  • X-ray diffraction
  • 1
  • RXND
  • 12
  • 10
  • 9
  • 1
  • Molar enthalpy of reaction, kJ/mol
  • Solution calorimetry
  • 1
  • RXND
  • 12
  • 11
  • 8
  • 1
  • Molar enthalpy of reaction, kJ/mol
  • Solution calorimetry
  • 1
  • RXND
  • 2
  • 3
  • 9
  • 4
  • 5
  • 6
  • Molar enthalpy of reaction, kJ/mol
  • Solution calorimetry
  • 1
  • RXND
  • 7
  • 3
  • 8
  • 4
  • 5
  • 6
  • Molar enthalpy of reaction, kJ/mol
  • Solution calorimetry
  • 1