Table 7.

Regression fit to Kamlet-Abboud-Taft polarity scales for linear optical features of used samples with percentage contribution of various interactions. (a, b, and c: regression coefficients)

Multi-parameter scale	ν0(103cm−1)	a(103cm−1)	b(103cm−1)	c(103cm−1)	R 2
Sample I
Absorbance	27.632 ± 0.149	0.685 ± 0.194	-0.640 ± 0.242	1.775 ± 0.250	0.88
Fluorescence	23.281 ± 0.623	0.071 ± 0.817	-3.777 ± 1.068	0.182 ± 1.013	0.77
Stokes Shift	23.281 ± 0.623	0.071 ± 0.817	-3.777 ± 1.068	0.182 ± 1.013	0.86
Sample II
Absorbance	27.614 ± 0.438	1.643 ± 0.546	-0.216 ± 0.737	2.031 ± 0.715	0.78
Fluorescence	26.989 ± 0.920	-2.362 ± 0.798	-3.296 ± 1.116	-4.444 ± 1.263	0.86
Stokes Shift	4.640 ± 0.324	2.097 ± 0.424	2.903 ± 0.576	1.906 ± 0.545	0.95
Sample III
Absorbance	29.341 ± 0.210	-0.920 ± 0.182	-0.584 ± 0.254	-0.985 ± 0.288	0.90
Fluorescence	23.533 ± 0.440	-2.534 ± 0.583	0.852 ± 0.780	-0.900 ± 0.738	0.76
Stokes Shift	5.037 ± 0.377	2.064 ± 0.526	-1.840 ± 0.821	1.364 ± 0.722	0.70
Sample IV
Absorbance	32.444 ± 0.474	-0.874 ± 0.373	-0.742 ± 0.588	-1.563 ± 0.580	0.75
Fluorescence	26.527 ± 0.813	-2.348 ± 0.705	-2.584 ± 0.986	-4.462 ± 1.115	0.87
Stokes Shift	5.156 ± 0.399	1.866 ± 0.346	2.290 ± 0.484	2.997 ± 0.548	0.94
	Multi-parameter scale	Pα(%)	Pβ(%)	Pπ*(%)
	Sample I
	Absorbance	22	21	57
	Fluorescence	2	94	4
	Stokes Shift	30	4	66
	Sample II
	Absorbance	42	6	52
	Fluorescence	23	33	44
	Stokes Shift	30	42	28
	Sample III
	Absorbance	37	23	40
	Fluorescence	59	20	21
	Stokes Shift	39	35	26
	Sample IV
	Absorbance	28	23	49
	Fluorescence	25	28	47
	Stokes Shift	26	32	42