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Table 4 Regression fits to the solvatochromic parameters (Eq. 1 )

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

No. Substituent ν0(103cm–1) s(103cm–1) b(103cm–1) a(103cm–1) r a s b F c Solvents used in the calculationd
1 H 21.92 1.81 0.80 0.52 0.9789 0.078 46 1–11
(±0.180) (±0.240) (±0.170) (±0.100)     
2 OH 21.34 −0.53 −0.86 −0.20 0.9417 0.099 21 2–13
(±0.155) (±0.269) (±0.280) (±0.191)     
3 OCH3 23.02 −0.66 0.22 −0.31 0.9614 0.037 24 1–10,13
(±0.159) (±0.089) (±0.078) (±0.104)     
4 CH3 23.02 −0.44 −0.19 −0.24 0.8128 0.099 5 1–10,12,13
(±0.159) (±0.222) (±0.197) (±0.118)     
5 Cl 21.28 2.57 0.61 −0.31 0.9802 0.081 57 1–11
(±0.183) (±0.246) (±0.176) (±0.098)     
6 Br 21.61 2.11 0.38 −0.27 0.9703 0.085 38 1–11
(±0.194) (±0.260) (±0.186) (±0.104)     
7 I 21.39 2.01 0.50 −0.25 0.9812 0.067 52 1–9,11
(±0.164) (±0.210) (±0.147) (±0.083)     
8 F 21.14 3.02 0.79 −0.43 0.9738 0.113 43 1–11
(±0.256) (±0.344) (±0.246) (±0.138)     
9 CN 24.50 −1.21 −0.51 0.10 0.9862 0.042 71 1–7,10–12
(±0.102) (±0.114) (±0.097) (±0.051)     
10 COOH 24.58 −1.25 −0.57 0.09 0.9823 0.046 64 1–7, 9–12
(±0.097) (±0.121) (±0.098) (±0.055)     
11 COCH3 23.73 −0.92 −0.23 −0.16 0.9878 0.027 94 1−12
(±0.050) (±0.062) (±0.057) (±0.033)     
12 NO2 27.02 −5.14 −1.71 0.47 0.9735 0.176 42 1–7,9,10,12,13
   (±0.398) (±0.533) (±0.382) (±0.214)     
  1. a Correlation coefficient.
  2. b Standard error of the estimate.
  3. c Fisher's test.
  4. d Solvent number as given in Table 3.