Table 1.

Chemical structure of evaluated compounds 1a–p, their surface tension γ (relative surface activity; in N/m units), wavelengths of observed absorption maxima (λ₁, λ_{2 (Ch-T)}, λ₃) and logarithms of molar absorption coefficients (log ε₁, log ε_{2 (Ch-T)}, log ε₃) of compounds’ methanolic solutions (c = 8.0 × 10⁻⁵ M), which were investigated in the UV/Vis region of an electromagnetic spectrum.

Comp.	R	X	Y	γ (N/m)	λ 1	log ε1	λ 2 (Ch-T)	1 log ε2 (Ch-T)	λ 3	log ε3
1a	2-OC4H9	A	C	0.06464	208	4.51	236	4.19	280	3.63
1b	2-OC5H11	A	C	0.06366	208	4.39	236	4.05	280	3.51
1c	2-OC6H13	A	C	0.06222	208	4.58	238	4.52	278	3.49
1d	2-OC7H15	A	C	0.05985	208	4.43	236	4.08	280	3.55
1e	3-OC4H9	A	D	0.06316	210	4.65	238	4.24	279	3.59
1f	3-OC5H11	A	D	0.06285	210	4.55	237	4.27	279	3.62
1g	3-OC6H13	A	D	0.06105	210	4.54	237	4.13	279	3.48
1h	3-OC7H15	A	D	0.05786	210	4.66	237	4.27	279	3.63
1i	2-OC4H9	B	C	0.06302	208	4.44	236	4.08	280	3.57
1j	2-OC5H11	B	C	0.06206	208	4.54	236	4.22	280	3.71
1k	2-OC6H13	B	C	0.06065	208	4.42	236	4.10	280	3.57
1l	2-OC7H15	B	C	0.05853	208	4.44	236	4.14	280	3.59
1m	3-OC4H9	B	D	0.06298	210	4.52	238	4.09	279	3.44
1n	3-OC5H11	B	D	0.06154	210	4.56	238	4.18	279	3.52
1o	3-OC6H13	B	D	0.05925	210	4.52	238	4.01	279	3.37
1p	3-OC7H15	B	D	0.05692	210	4.65	238	4.20	279	3.56

¹ log ε_{2 (Ch-T)}, Logarithms of molar absorption coefficients observed at the charge-transfer absorption maximum λ_{2 (Ch-T)} = 236–238 nm.