Table 4: Stepwise thermal degradation data obtained from TGA curves for the metal complexes.

ComplexMolar massTG range ( ) DTGmax ( )Weight loss Predicated intermediates and final products Metallic residue (calcd. %) found
Calcd.Found

[L2Zn] ⋅ H2O, C22H24N8S2O3Zn 577.332–120723.12.9H2OZnS
136–32826149.849.22-BTA(16.5) 17.4
[L2Cu], C22H22N8S2O2Cu557.5158–31621651.651.22-BTACuS
449–54950031.230.9SO2 + L1(17.2) 17.9
[L2Ni], C22H22N8S2O2Ni552.732–99 78 1.6 1.5 H2O
222–33129052.151.82-BTANiS
414–60853131.431.1SO2 + L1(16.4) 17.1
[L2Co], C22H22N8S2O2Co 552.9222–33129052.0852.72-BTACoS
414–60853131.429.9SO2 + L1(16.5) 17.4
222–33129052.0852.72-BTACoS

BTA = benzotriazole ring, L1 = C6H10N2.