Synthesis, structure and solvatochromic properties of some novel 5-arylazo-6-hydroxy-4-phenyl-3-cyano-2-pyridone dyes

Table 3 Solvent parameters[21]

No.	Solvent	π*	β	α
1	Methanol	0.60	0.62	0.93
2	Ethanol	0.54	0.77	0.83
3	Propan-1-ol	0.52	0.83	0.8
4	Propan-2-ol	0.48	0.95	0.76
5	Butan-1-ol	0.47	0.88	0.79
6	2-Methylpropan-2-ol	0.41	0.11	0.68
7	Tetrahydrofuran	0.58	0.55	0
8	Dioxane	0.55	0.37	0
9	Methyl acetate	0.60	0.42	0
10	Ethyl acetate	0.55	0.45	0
11	N,N-Dimethylformamide	0.88	0.69	0
12	N,N-Dimethylacetamide	0.88	0.76	0
13	Dimethyl sulfoxide	1.00	0.76	0

ISSN: 2661-801X