TG, DTA Pyrolytic Analysis of Cobalt, Nickel, Copper, Zinc, and 5,8-Dihydroxy-1,4-Naphthoquinone Chelate Complexes

Table 2

Analytical data on the nonisothermal decomposition of [(C₁₀H₆O₄)₃ (Co)₂. 4H₂O] 3H₂O.

Reaction	Loss	Composition	Found	Calc.
Plateau I, ambient at 100°C	—	[(C10H6O4)3 (Co)2.4H2O] 3H2O	—	—
Sigmoid I	7H2O
100^oC–169^oC
Ti^oC			100	—
Tf^oC			169	—
Loss to
(C10H6O4)3 (Co)2			15.17	15.46
Plateau II, 169°–200°C		(C10H6O4)3 (Co)2
Sigmoid II	3/2C10H6O4
200^o–363^oC
Ti^oC			200
Tf^oC			363
Loss to
3/2(C10H6O4) (Co)2			49.08	49.26
Plateau III, 363°–500°C		3/2 (C10H6O4) (Co)2
Sigmoid III	3/2C10H6O4
500°–600°C
Ti °C			500
Tf °C			600
Loss to
Co3O8			83.56	87.78
Co3O8			16.44	12.19