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Table 2 Empirical parameters of solvent polarity

From: Solvent effect on the spectral properties of Neutral Red

Solvent

ET (30) kcal/mol

ET (NR) kcal/mol

f(ε, n)

g(n)

φ(ε, n)

Water

62.8

54.25

0.91363

0.226851

1.367334

Propan-1-ol

50.7

53.14

0.77905

0.262207

1.303468

Chloroform

39.1

54.77

0.37245

0.300187

0.972823

Acetonitrile

55.4

53.84

0.86602

0.234279

1.334575

DMSO

45.1

52.36

0.84132

0.323779

1.488877

Ethanol

51.9

53.24

0.81293

0.245993

1.304918

Acetone

39.1

54.45

0.79028

0.244380

1.279042

DMF

43.2

52.95

0.83944

0.292021

1.423484

Acetic acid

51.7

53.54

0.49972

0.254245

1.004628

Ethyleneglycol

56.3

54.77

1.11158

0.292350

1.696281

Nitrobenzene

41.2

52.55

0.78171

0.369957

1.521691