Branched benzothiadiazole-cored oligomers with terminal carbazoles: Synthesis and fluorescence probing nitroaromatics

Effects of the acceptor pattern and substitution position on the properties of N-phenyl-carbazolyl based donor–acceptor–donor molecules

“…A serials of solvents including n-hexane, dichloromethane, trichloromethane, methylbenzene, tetrahydrofuran, acetonitrile, DMF, methanol and dimethyl sulfoxide were used as the solvent to prepare solutions. The D-A-D compounds, including 4,7-bis(9-phenyl-9H-carbazole-2-yl) benzo[c] [1,2,5] thiadiazole (BPC-2BTD), 4,7-bis(9-phenyl-9Hcarbazole-2-yl)benzo[c] [1,2,5]selenadiazole (BPC-2BSe), 4,7bis(9-phenyl-9H-carbazole-3-yl)thiadiazole (BPC-3BTD) and 4,7bis (9-phenyl-9H-carbazole-3-yl)selenadiazole (BPC-3BSe), were dissolved in the above solvents to a respectively, with the determined concentration of 1 Â 10 À5 mol L À1 . The prepared solutions were undertaken for UV-vis measurement with a scan range of 200-800 nm.…”

“…The solid was dried in a vacuum oven for 20 hours and reserved for further application. 1 To prepare 4,7-dibromo-2,1,3-benzoselenadiazole, 9.47 g (36.91 mM) 3,6-dibromo-1,2-phenylenediamine was dissolved in 200 mL ethyl alcohol in a ask, and the solution was heated to 90 C in a water bath. At the same time, 4.2 g of SeO 2 (37.85 mM) was dissolved into 50 mL hot water, and the solution was added to the reaction ask slowly.…”

“…The mixture was reuxed for 2 h, and 4,7dibromo-2,1,3-benzoselenadiazole was afforded from vacuum ltration. 28 The yellow solid was then washed with ethanol three times, with water three times and dried under vacuum at 50 C. 1…”

“…Finally, 2.2 g of yellow powder was collected (yield of 68%), and termed BPC- 13 The synthesis of BPC-2BSe was the same as for BPC-2BTD, which was obtained as a uffy yellow solid with a yield of 71%. 1 BPC-3BTD was obtained as a the yellow solid with a yield of 72%, and the procedure used was the same as the above two compounds. 1 Similarly, the fourth compound BPC-3BSe was produced as a reddish-orange solid in a yield of 68.7%.…”

New V-shaped push-pull systems based upon 4,5-di(hetero)aryl substituted pyrimidines: their synthesis and application for the detection of nitroaromatic explosives

“…[13][14][15][16][17][18][19][20][21][22][23][24][25][26] Furthermore, triphenylamine and carbazolebased compounds are used successfully as sensors for the detection of nitroaromatic explosives. [27][28][29][30][31] Oligothiophenes and their derivatives have also been employed successfully as sensing elements for detection of explosives. In particular, terthiophene derivatives have been immobilized in a monolayer on the surface of a glass plate, and the fluorescent films obtained used for the sensing of nitro-containing explosives both in the vapor phase and in aqueous media.…”