کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5224747 | 1383526 | 2008 | 8 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Synthesis, characterization and photophysical properties of benzidine-based compounds Synthesis, characterization and photophysical properties of benzidine-based compounds](/preview/png/5224747.png)
The N-alkylation of the 3,3â²-diaminobenzidine with innocent substituents leads to unusual properties. The emission of the benzidine core can be fine-tuned by subtle modifications, and the N-substitution with benzylic groups results in photoinduced exciplexes with distinct and increased emission. This compound constitutes the first example of intramolecular exciplex containing benzidine unit. We also show that these photoinduced processes could be modulated by proton input, and that the diprotonation of the benzidine core disrupted the intramolecular communication in the excited states with a concomitant inhibition of the ligand-centred fluorescence. Furthermore, upon photo-irradiation at 254Â nm, semiquinone imine and quinone diimine systems are produced in CH2Cl2 of which the photolysis generates Cl radicals, which rapidly oxidize the tetraamine compounds.
Emission of the benzidine core can be fine-tuned by subtle modifications and, interestingly, N-benzylation results in photoinduced exciplex. These photoinduced processes could be modulated by proton input.
Journal: Tetrahedron - Volume 64, Issue 27, 30 June 2008, Pages 6522-6529