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Table 1 Absorption maxima of Neutral Red(NR) in various solvents and selective Kamlet-Taft solvent properties

From: Solvent effect on the spectral properties of Neutral Red

Solvent λ(nm) π* α β ε n
Water 527 1.09 1.17 0.18 80.1 1.3330
Propan-1-ol 538 0.52 0.84 0.90 20.33 1.3856
Chloroform 522 0.58 0.44 0.0 4.81 1.4429
Acetonitrile 531 0.75 0.19 0.31 38.80 1.3440
DMSO 546 1.0 0.0 0.76 47.2 1.4790
Ethanol 537 0.54 0.83 0.77 24.55 1.3614
Acetone 525 0.71 0.08 0.48 20.70 1.3590
DMF 540 0.88 0.0 0.69 38.3 1.4305
Acetic acid 534 0.64 1.12 - 6.2 1.3710
Ethyleneglycol 539 0.92 0.9 0.52 38.7 1.4310
Nitrobenzene 544 1.01 0.0 0.39 32.0 1.5510