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

Table 3

Analytical data on the nonisothermal decomposition of [(C₁₀H₆O₄)₃ (Ni)₂ 4H₂O] 1½H₂O.

Reaction	Loss	Composition	Found	Calc.
Plateau I, ambient at 99.9°C	—	[(C10H6O4)3(Ni)2.4H2O] ½H2O	—	—
Sigmoid I	5½H2O		12.98	12.60
99.9°–136°C
Ti °C			99.9
Tf °C			136
Loss to
(C10H6O4)3(Ni)2
Plateau II, 136°–300°C		(C10H6O4)3(Ni)2
Sigmoid II	1¼C10H6O4		43.28	42.84
300°–365°C
Ti °C			300
Tf °C			365
Loss to
7/4(C10H6O4) (Ni)2
Plateau III, 365°–500°C		7/4(C10H6O4) (Ni)2
Sigmoid III	7/4C10H6O4		77.73	81.17
500°–600°C
Ti^oC			500
Tf^oC			600
Loss to
NiO
NiO (600°C onwards)			22.27	18.83