Synthesis Of Photosensitizing Polyimide Of Complex Between 3-(2'- Thiazolylazo)- 2,6 - Diamino Pyridine And Ruthenium (II).

Abstract: 2-aminothiazole was diazotized with sodium nitrite and 6 (M) hydrochloric acid then diazonium salt was coupled with 2,6 - diamino pyridine at 00c. Then the solution was basified with 0.001(M) sodium hydroxide solution until PH=6.0 was reached. A red Precipitate began to settle immediately. Ruthenium (II) complex was synthesized by treating azo dye, 3-(2’-thizolylazo)-2,6-diamine pyridine and dichloro (p-cymene) ruthenium (II)dimer in dry DMF heated at 600c for 4h under argon in the dark. Subsequently 2,2’- bipyridine- 4,4’-dimethyl was added and the reaction mixture was heated at 1400c for another 4h. To the resulting solution was added ammonium thio cyanate in water and the reaction mixture was further heated at 1500c for 3h. DMF was removed on rotary evaporator under high vacuum and water was added to get the precipitate. Polyimide was synthesized by treating ruthenium (II) complex with 6 FDA in presence of DMF firstly stirred at 400c for 24h to get viscous polyamic acid then to this solution acetic anhydride and pyridine were added and stirring was continued at 1000c for 24h. Keywords : 3-(2’- thiazolylazo) -2,6- diamino pyridine , ruthenium complex, polyimide.