Table 8 Regression fits to Kamlet–Abboud–Taft solvatochromic parameters for absorbance, fluorescence and Stokes’ shift for Hydrazone form of dyes in LCs.
Dyes | \((\tilde{v}_{{}} )_{0} (10^{3} cm^{ - 1} )\) | \(a\,\left( {10^{3} cm^{ - 1} } \right)\) | \(b\;\left( {10^{3} cm^{ - 1} } \right)\) | \(s\,\left( {10^{3} cm^{ - 1} } \right)\) | R2 |
|---|---|---|---|---|---|
Ponceau 4R | |||||
Absorbance | 15.341 (± 4.384) | 0.439 (± 0.338) | 12.413 (± 1.774) | − 7.024(± 0.959) | 0.86 |
Fluorescence | 12.420 (± 5.206) | − 0.300 (± 0.737) | 5.659 (± 1.973) | − 3.853 (± 1.042) | 0.94 |
Stokes’ shift | 4.048 (± 0.454) | 1.319(± 0.351) | 34.138(± 1.841) | − 17.821(± 9.948) | 0.94 |
Sunset yellow FCF | |||||
Absorbance | 9.636 (± 8.246) | 0.657(± 0.961) | 32.904(± 3.525) | − 16.335(± 1.986) | 0.80 |
Fluorescence | 7.565 (± 5.207) | − 1.866 (± 0.631) | 30.071(± 2.076) | − 18.120 (± 1.115) | 0.97 |
Stokes’ shift | 0.532 (± 0.539) | 2.558 (± 2.149) | 10.495(± 8.716) | − 3.024(± 1.154) | 0.98 |
Tartrazine | |||||
Absorbance | 34.340 (± 7.116) | − 1.095 (± 1.008) | − 53.360 (± 26.970) | 28.576(± 14.254) | 0.86 |
Fluorescence | 16.802 (± 4.177) | − 1.011 (± 0.461) | − 14.950 (± 12.350) | 7.572(± 6.528) | 0.89 |
Stokes’ shift | 17.537 (± 1.037) | − 0.083 (± 0.147) | − 38.409 (± 3.930) | 21.004 (± 2.078) | 0.82 |
