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Table 3 Solvent parameters[21]

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

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