Table 4: Kinetic parameters of Cu2+, Ni2+, and Pt4+ complexes evaluated by Horowitz-Metzger (HM) and Coats-Redfern (CR) methods.
Step | Mid (Temp (K)) | Method | Ea (KJ/mol) | A (S−1) | ΔH* (KJ/mol) | ΔS* (KJ/mol) | ΔG* (KJ/mol) |
Ni2+ complex | |||||||
1st | 80 | CR | 36.9 | 2 × 104 | 34.03 | −0.18 | 96.3 |
HM | 42.61 | 1 × 106 | 39.68 | −0.28 | 96.91 | ||
2nd | 295 | CR | 83.06 | 1.87 × 106 | 78.44 | −0.13 | 150.8 |
HM | 91.78 | 0.86 × 109 | 87.38 | −0.28 | 150.78 | ||
3rd | 633 | CR | 142.92 | 0.9 × 107 | 137.58 | −0.1 | 216.16 |
HM | 156.93 | 0.41 × 1011 | 150.01 | −0.29 | 216.67 | ||
Pt4+ complex | |||||||
1st | 170 | CR | 109.56 | 1.58 × 109 | 106.69 | −0.07 | 130.9 |
HM | 118.25 | 1.16 × 107 | 113.97 | −0.28 | 130.11 | ||
2nd | 450 | CR | 73.09 | 0.54 × 104 | 68.47 | −0.13 | 167.89 |
HM | 83.38 | 0.06 × 106 | 78.05 | −0.28 | 167.18 | ||
3rd | 633 | CR | 387.47 | 1.35 × 1020 | 381.93 | 0.13 | 292.87 |
HM | 399.57 | 0.58 × 1017 | 392.01 | −0.3 | 292.27 | ||
Cu2+ complex | |||||||
1st | 444 | CR | 117.17 | 4.32 × 1011 | 113.47 | −0.025 | 124.79 |
HM | 125.06 | 3.83 × 1012 | 121.37 | −0.007 | 124.63 | ||
2nd | 710 | CR | 88.73 | 1.03 × 104 | 82.82 | −0.175 | 207.4 |
HM | 101.61 | 1.02 × 105 | 95.72 | −0.156 | 206.43 | ||