Slow solvation dynamics of 4-AP and DCM in binary mixtures

In a binary mixture of benzene and dimethylformamide (DMF), solvation dynamics of 4-aminophthalimide (4-AP) and 4-(dicyanomethylene)-2-methyl-6-(p-dimethylaminostyryl)-4H-pyran (DCM) displays a slow component. As mole fraction of DMF increases from 0.028 to 0.28 the average solvation time (〈τs〉) for 4-AP decreases from 830 to 450 ps while for DCM it decreases from 450 to 100 ps. In dioxane-water mixtures 〈τs〉 for DCM is 250 ps which remains unaffected as mole fraction of water increases from 0.22 to 0.50.