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Table 5 Percentage contribution of the solvatochromic parameters

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

Substituent Pπ*(%) Pβ(%) Pα(%)
H 58 25 17
OH 33 54 13
OCH3 55 19 26
CH3 50 22 28
Cl 74 17 9
Br 76 14 40
I 73 18 9
F 71 19 10
CN 66 28 6
COOH 65 30 5
COCH3 70 18 12
NO2 70 23 7