Table 3.

Stepwise thermal decomposition of metal complexes.

Compounds	Stages	Range	Weight Loss (%)	Residue (%)
HL-Cu	I	25.08–223.04	9.32	43.45
	II	223.04–527.11	18.56
	III	527.11–691.77	28.67
HL-Zn	I	29.20.-224.04	10.56	27.54
	II	224.04–531.71	34.22
	III	531.71–710.98	24.71