Research Article
TG, DTA Pyrolytic Analysis of Cobalt, Nickel, Copper, Zinc, and 5,8-Dihydroxy-1,4-Naphthoquinone Chelate Complexes
Table 4
Analytical data on the nonisothermal decomposition of [(C10H6O4)3 (Cu)2] 4H2O.
| Reaction | Loss | Composition | Found | Calc |
| Plateau I ambient at 26.5°C | — | [(C10H6O4)3 (Cu)2] 4H2O | — | — | Sigmoid I | 4H2O | | | | 26.5°C–71°C. | | | | Ti °C | | 26.5 | — | Tf °C | | 71 | — | Loss to | | | | (C10H6O4)3 (Cu)2 | | 9.52 | 9.38 | Plateau II, 71°–300°C | | (C10H6O4)3 (Cu)2 | | | Sigmoid II | C10H6O4 | | | | 300°–400°C | | | | Ti °C | | 300 | | Tf °C | | 400 | | Loss to | | | | (C10H6O4)2 (Cu)2 | | 35.64 | 34.11 | Plateau III, 400°–500°C | | (C10H6O4)2 (Cu)2 | | | Sigmoid III | 3/2(C10H6O4) | | | | 500°–545°C | | | | Ti °C | | 500 | | Tf °C | | 545 | | Loss to | | | | ½C10H6O4 Cu2 | | 68.63 | 70.57 |
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