Organic solvents Solvents A ε L mol-1 cm-1 Acetonitrile 0.319 0.79 x 104 Acetone 0.716 1.77 x 104 Methanol 1.303 3.22 x 104 1,4-Dioxane 0.015 0.04 x 104 Tetrahydrofuran 0.784 1.94 x 104 Cyclohexanone 0.306 0.76 x 104 Ethanol 1.414 3.49 x 104 2-Propanol 0.862 2.13 x 104 Chloroform 0.610 1.51 x 104

Table 2: The molar absorptivity values of NPZ-TCNQ CT complex in different solvents.