Research Article
Potentiometric and Thermodynamic Studies of Some Schiff-Base Derivatives of 4-Aminoantipyrine and Their Metal Complexes
Table 5
Thermodynamic functions for ML and ML
2 complexes of ligand (L
1) in 10% (by volume) ethanol-water mixture and 0.1 mol
dm
−3 KCl.
| | /K | Gibbs energy/kJmol−1 | Enthalpy/kJmol−1 | Entropy/Jmol−1K−1 | | | | | | |
| | 298 | 39.03 | 34.46 | | | 237.52 | 225.21 | Mn2+ | 308 | 41.39 | 36.68 | 31.75 | 32.65 | 237.50 | 225.10 | | 318 | 43.78 | 38.97 | | | 237.52 | 225.21 |
| | 298 | 39.66 | 34.98 | | | 242.64 | 223.92 | Co2+ | 308 | 42.05 | 37.21 | 32.64 | 31.75 | 242.52 | 223.91 | | 318 | 44.51 | 39.46 | | | 242.64 | 223.92 |
| | 298 | 40.06 | 35.32 | | | 243.98 | 225.07 | Ni2+ | 308 | 42.46 | 37.57 | 32.65 | 31.75 | 243.87 | 225.06 | | 318 | 44.94 | 39.82 | | | 243.98 | 225.07 |
| | 298 | 40.79 | 36.18 | | | 252.55 | 230.96 | Cu2+ | 308 | 43.29 | 38.45 | 34.46 | 32.65 | 252.43 | 230.84 | | 318 | 45.85 | 40.79 | | | 252.55 | 230.96 |
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