| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 78627 | Solar Energy Materials and Solar Cells | 2011 | 10 Pages |
Crystalline compounds (C14H29NH3)2CuCl4(s) and (C15H31NH3)2CuCl4(s) were synthesized. X-ray crystallography was applied to characterize crystal structures of the two compounds. The crystal system is both monoclinic, the space group is both C2/c, and Z=4. The lattice potential energies of the title compounds were calculated to be UPOT [(C14H29NH3)2CuCl4, s]=853.12 kJ/mol and UPOT [(C15H31NH3)2CuCl4, s]=854.93 kJ/mol. Low-temperature heat capacities of the two compounds were measured by a precision automatic adiabatic calorimeter over the temperature range from 78 to 395 K. The temperatures, molar enthalpies, and entropies of two phase transitions for each of the two complexes were determined to be: for (C14H29NH3)2CuCl4(s), 342.35±0.11 K, 76.17±0.40 kJ/mol, and 222.49±1.20 J/K mol for the first peak; 352.61±0.09 K, 27.83±0.27 kJ/mol, and 78.92±0.78 J/K mol for the second peak, and for (C15H31NH3)2CuCl4(s), they were 345.40±0.93 K, 62.06±1.07 kJ/mol, and 179.67±2.63 J/K mol for the first peak; 360.98±0.25 K, 21.66±0.76 kJ/mol, and 60.00±2.09 J/K mol for the second peak, respectively. The smoothed heat capacities and thermodynamic functions (HTο−H298.15ο) and (ΔtrsSm=ΔtrsHm/Ttrs) of the two compounds were calculated with an interval of 5 K based on the experimental heat capacities.
Graphical abstractThe crystal structures of the two compounds were characterized. Low-temperature heat capacities were measured over the temperature range from 78 to 395 K. The thermodynamic properties of two phase transitions for each of the two complexes were determined .Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Crystal structures of the two compounds were characterized. ► Low-temperature heat capacities of the two compounds were measured over the temperature range from 78 to 395 K. ► Thermodynamic properties of two phase transitions for each of the two complexes were determined. ► The smoothed heat capacities and the thermodynamic functions of the two compounds were calculated.
