902277-27-4Relevant academic research and scientific papers
A benzo-15-crown-5-modifying ratiometric-absorption and fluorescent OFF-ON chemosensor for Cu2 +
Chen, Yuting,Wang, Xinxin,Wang, Kaili,Zhang, Xiuling
, p. 144 - 149 (2016)
One new benzo-15-crown-5-modifying fluorene Schiff base (FBC), together with the C=N-linked fluorene-3,4-dimethoxybenzene (FBDMO) and fluorene-benzene (FB) references, has been designed and facilely synthesized. The binding of Cu2 + with nitrogen atom of C=N moiety in these three compounds can inhibit the photo-induced electronic transition process and induce the ratiometric-absorption and fluorescent OFF-ON response to Cu2 +. Whereas the employment of benzo-15-crown-5 moiety in FBC as additional binding platform for Cu2 + not only amplifies the fluorescent enhancement of FBC via preventing the isomerization of C=N moiety, but also endows this compound high selectivity and rapid response towards Cu2 + over the references FB and FBDMO. These results render FBC highly sensitive ratiometric-absorption and fluorescent OFF-ON detecting potential for Cu2 + with the detection limit of 3.91 × 10- 6 M.
An efficient catalyst for the synthesis of schiff bases
Fareed, Ghulam,Versiani, Muhammad Ali,Afza, Nighat,Fareed, Nazia,Kalhoro, Mahboob Ali,Yasmeen, Shazia,Anwar, Muhammad Aijaz
, p. 426 - 430 (2013/07/27)
An efficient high yielding synthesis of Schiff bases (1-17) is derived from condensation of 2-fluorenamine and 4-amino phenol with a variety of aldehydes catalyzed by dodecatungstosilicic acid / P2O5 under solvent free conditions at room temperature. The catayst is found to be more efficient in terms of ease of reaction workup and high yields. This methodology contributes to an energy efficient, facile and environamental friendly synthesis for the preparation of Schiff bases. The structures of afforded Schiff bases were characterized by spectroscopic data and elemental analysis.
