Table 5. Job’s Plot Data for the Tested Compounds in the Presence of Fe³⁺ and Cu^2+a.

	Fe3+			Cu2+
cmpd	λ (nm)	X	n	λ (nm)	X	n
18	375	0.69	2	330	0.70	2
19	375	0.68	2	330	0.51	1
20	370	X1 = 0.53	n1 = 1	330	0.53	1
		X2 = 0.80	n2 = 4
25	318	X1 = 0.57	n1 = 1	330	0.44	1
		X2 = 0.77	n2 = 3
28	316	X1 = 0.53	n1 = 1	330	0.53	1
		X2 = 0.74	n2 = 3
30	310	X1 = 0.53	n1 = 1	312	0.50	1
		X2 = 0.74	n2 = 3

^aThe table shows the wavelength values (λ) in which the absorbance variation was measured, the molar ratios (X) that cause the maximum variation of absorbance, and the coordination values (n) that correspond to the number of ligand molecules per cation.