Table 1.

Electronic spectral data in acetonitrile for H₂L and Ni(II)L and their calibration curves.

Compound	Band Maxima (cm−1)	Wavelength (nm)	Assignment	Calibration Equation/Figure (C in µM)
H2L	37,175	269	n→π*	Abs2 = −0.0573 + 0.0416·C/Figure 17b
	30,215	331	π→π*	Abs1 = −0.0422 + 0.0318·C/Figure 17b
Ni(II)L	38,911	257	π→π*	Abs3 = −0.0546 + 0.0581·C/Figure 18b
	26,738	373	n→π*	Abs2 = −0.0308+ 0.0329·C/Figure 18b
	21,097	474	1A1g→1B1g	Abs1 = −0.0095 + 0.0108·C/Figure 18b