Transition Metal(II) Complexes with Cefotaxime-Derived Schiff Base: Synthesis, Characterization, and Antimicrobial Studies

Table 4

Thermogravimetric data of Co(II), Ni(II), and Cu(II) complexes.

Complex	Steps	Thermal effect	Temperature range (°C)	Δ𝑚exp %	Δ𝑚calc %	Lost fragment
[CoL2(H2O)2]; CoC46H42S4O18N10Na2	1	Endothermic	70–117	11.53	11.63	C6O4H10
	2	Exothermic	117–197	2.55	2.86	2𝑥H2O
	3	Exothermic	197–294	32.71	32.67	C14H8O6S2N2Na2
	4	Endothermic	294–453	15.61	15.93	C6O4H8N4
	5	Exothermic	453–595	32.75	32.19	degradation products +
				4.58	4.69	metallic oxide residue
[NiL2(H2O)2]; NiC46H42S4O18N10Na2	1	Endothermic	75–125	11.73	11.63	C6O4H10
	2	Exothermic	125–205	2.35	2.86	2𝑥H2O
	3	Exothermic	205–302	31.71	32.67	C14H8O6S2N2Na2
	4	Endothermic	302–460	14.61	15.93	C6O4H8N4
	5	Exothermic	460–602	31.75	32.19	degradation products +
				4.78	4.72	metallic oxide residue
[CuL2(H2O)2]; CuC46H42S4O18N10Na2	1	Endothermic	80–127	11.79	11.59	C6O4H10
	2	Exothermic	127–207	2.55	2.85	2𝑥H2O
	3	Exothermic	207–304	32.71	32.55	C14H8O6S2N2Na2
	4	Endothermic	304–463	15.61	15.87	C6O4H8N4
	5	Exothermic	463–605	32.15	32.07	Degradation products +
				4.98	5.04	metallic oxide residue