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.

ReactionLossCompositionFoundCalc

Plateau I ambient at 26.5°C[(C10H6O4)3 (Cu)2] 4H2O
 Sigmoid I4H2O
 26.5°C–71°C.
 Ti °C26.5
 Tf °C71
 Loss to
  (C10H6O4)3 (Cu)29.529.38
Plateau II, 71°–300°C(C10H6O4)3 (Cu)2
 Sigmoid IIC10H6O4
 300°–400°C
 Ti °C300
 Tf °C400
 Loss to
  (C10H6O4)2 (Cu)235.6434.11
Plateau III, 400°–500°C(C10H6O4)2 (Cu)2
 Sigmoid III3/2(C10H6O4)
 500°–545°C
 Ti °C500
 Tf °C545
 Loss to
 ½C10H6O4 Cu268.6370.57