New Nanosized V(III), Fe(III), and Ni(II) Complexes Comprising Schiff Base and 2-Amino-4-Methyl Pyrimidine: Synthesis, Properties, and Biological Activity

Table 4

Thermal decomposition data of metal compounds.

Compound	Step	Temp. range °C	Assignment	TGA (Wt. loss %); Found (calcd.)
V(III) complex	1^st	82–155	Loss of coordinated water molecules (H2O)	2.55 (3.00)
	2^nd	157–260	Loss of two chloride atoms	11.47 (11.83)
				17.98 (18.21)
	3^rd	262–348	Loss of ligand (AMPY)	58.12 (58.48)
	4^th	350–550	Decomposition with the formation of final product vanadium oxide	10.92 (11.17)
Fe(III) complex	1^st	80–162	Loss of coordinated water molecules (H2O)	2.52 (2.98)
	2^nd	164–260	Loss of two chloride atoms	11.40 (11.73)
	3^rd	262–550	Thermal decomposition of the rest of the complex and forming iron oxide	74.92 (76.07)
				11.57 (11.89)
Ni(II) complex	1^st	76–140	Loss of coordinated water molecules (H2O)	2.75 (2.96)
				11.31 (11.68)
	2^nd	142–248	Loss of two chloride atoms	17.64 (17.98)
	3^rd	250–347	Loss of ligand (AMPY)	57.53 (57.74)
	4^th	349–550	Thermal decomposition of the rest of the complex, and forming nickel oxide	11.72 (12.30)