Table 5 Thermal analysis of the Schiff base and its metal complexes.
Compound | Steps | Temp. Range oC | Mass loss % | Decomposition process | Residue | |
|---|---|---|---|---|---|---|
Found | Calcd | Found (Calcd. %) | ||||
Schiff base ligand L−Na+. (H2O)(CH3OH) | I | 50–170 | 8.24 | 8.21 | CH3OH + H2O | 0.5 Na2O + 5C 15 (14.93) |
II | 170–490 | 43.76 | 43.68 | C6H4N2O2S + C5H8NO | ||
III | 490–800 | 33.00 | 33.17 | C5H10N2O4.5S | ||
Iron III complex [FeIIIL−(H2O)(Cl−)2](CH3OH)∙(H2O) | I | 10–80 | 6.88 | 6.84 | H2O + CH3OH | FeO 9.59 (9.82) |
II | 80–195 | 35.75 | 35.56 | H2O + C8H13NO3 + Cl2 | ||
III | 195–800 | 47.78 | 47.77 | C13H9N4O4S2 | ||
Cobalt II complex [CoIIL−(H2O)2(Cl−)](H2O) | I | 50–451 | 72.50 | 72.69 | 3H2O + C17H19N4O6S + HCl | CoS + 2C 16.80 (16.79) |
II | 451–800 | 10.70 | 10.52 | C2H2NO2 | ||
Nickel II complex [NiIIL−(H2O)2(Cl−)](CH3OH) | I | 50–145 | 4.64 | 4.59 | CH3OH | NiO + 2C 13.93 (14.13) |
II | 145–455 | 75 | 74.99 | 2H2O + C18H19N4O6S2 + HCl | ||
III | 455–800 | 6.43 | 6.30 | CH2NO | ||
Copper II complex [CuII L−(NO3−)(H2O)(CH3OH)](H2O) | I | 10–105 | 6.77 | 6.86 | CH3OH + H2O | CuO + 2C 14.20 (14.18) |
II | 105–800 | 79.03 | 78.96 | H2O + C19H22N5O7S2 + NO3- | ||
