Synthesis, Characterization, and Biological Activity of N^𝟏-Methyl-2-(𝟏H-1,2,3-Benzotriazol-1-y1)-3-Oxobutan- ethioamide Complexes with Some Divalent Metal (II) Ions

Table 4

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

Complex	Molar mass	TG range (^∘C)	DTGmax (^∘C)	Weight loss		Predicated intermediates and final products	Metallic residue (calcd. %) found
				Calcd.	Found
[L2Zn] ⋅ H2O, C22H24N8S2O3Zn	577.3	32–120	72	3.1	2.9	H2O	ZnS
		136–328	261	49.8	49.2	2-BTA	(16.5) 17.4
[L2Cu], C22H22N8S2O2Cu	557.5	158–316	216	51.6	51.2	2-BTA	CuS
		449–549	500	31.2	30.9	SO2 + L1	(17.2) 17.9
[L2Ni], C22H22N8S2O2Ni	552.7	32–99	78	1.6	1.5	1/2 H2O
		222–331	290	52.1	51.8	2-BTA	NiS
		414–608	531	31.4	31.1	SO2 + L1	(16.4) 17.1
[L2Co], C22H22N8S2O2Co	552.9	222–331	290	52.08	52.7	2-BTA	CoS
		414–608	531	31.4	29.9	SO2 + L1	(16.5) 17.4
		222–331	290	52.08	52.7	2-BTA	CoS

BTA = benzotriazole ring, L₁ = C₆H₁₀N₂.