Author/Authors :
Xu، نويسنده , , Tinghua and Lu، نويسنده , , Ran and Jin، نويسنده , , Ming and Qiu، نويسنده , , Xianping and Xue، نويسنده , , Pengchong and Bao، نويسنده , , Chunyan and Zhao، نويسنده , , Yingying، نويسنده ,
Abstract :
Novel monodisperse linear 3,9-linked oligocarbazoles (OCAs) were prepared stepwise using Ullmann coupling reaction in seal-tubes. The resulting OCAs were soluble in common organic solvents. The UV–vis spectra of OCAs exhibited small red shift and their intensities increased linearly with the increase of the carbazole moieties, suggesting that no intramolecular π-interactions appeared at ⩽8-mer. All the OCAs gave strong fluorescence and it was found that the conjugated degree of linear OCAs would be saturated when the number of carbazole units reaches four.
Keywords :
fluorescence , Seal-tube , carbazoles , Ullmann coupling , iodination , Oligomers
