Table 1.

Slopes m₁ and m₂ determined using respectively the plot of Stokes shifts against function F₁(ε,n) and the plot of ($v_a$ + $v_f$)/2 against ${\mathrm{F}}_2(\mathrm{\epsilon },\mathrm{n})$.

	m1	m2	µe/µg	µe [D]	µg [D]	Δµ [D]	Number of points	r2
Bakhshiev Kawski-Chamma-Viallet method
I	2016.44	− 960.53	2.82	3.14	1.11	2.03	8:7	0.83:0.58
I	3269.13	− 960.53	1.83	3.50	1.91	1.59	8:7	0.92:0.58
II	594.14	− 2145.42	1.77	5.32	3.01	2.31	6:8	0.84:0.82
II	4197.07	− 2145.42	3.09	4.63	1.50	3.14	8:8	0.92:0.82

	m	Δµ [D]	Number of points	r2
Reichardt method
I	1928.23	2.29	8	0.93
II	2917.52	2.81	7	0.92

Slope m was determined using the plot of Stokes shifts against function ${\mathrm{E}}_{\mathrm{T}}^{\mathrm{N}}$ along with ground-state dipole moment ${\mathrm{\mu }}_{\mathrm{g}}$, excited-state dipole moment ${\mathrm{\mu }}_{\mathrm{e}}$, change in dipole moment ∆μ, number of points and correlations factor r² determined for both positions of maximum absorbance (I ~ 320 nm and II ~ 286 nm) for NTBD.