Perylene tetracarboxylic dianhydride (PTCDA) (10.2 mmol, 4g) was dissolved in dry acetonitrile (80 mL), in a hot air oven dried 250 ml double-neck round bottom flask fitted with dry tube and continuous flow of nitrogen on the other side. The reaction mixture was allowed to stir at ambient temperature for half an hour. To the stirred reaction mixture, 1-bromooctane (15.31 mmol, 2.5 mL) was added dropwise for the time duration of 15 minutes, followed by the addition of 1-octanol (15.31 mmol, 2.42 mL) through the dropping funnel over the period of 15 minutes. Further, the reaction is continued for next half an hour and subjected to the dropwise addition of 1,8-diazabicyclo [5.4.0]undec-7-ene (6.5 mmol, 1 ml) for the duration of 10 minutes at ambient temperature. After that the reaction vessel was shifted to the refluxing unit at 85 o C for the time duration of 20 hours under continuous flow of nitrogen.