Indium(<scp>iii</scp>)-catalyzed efficient synthesis of 3-arylhydrazonoindolin-2-ones and their fluorescent metal sensing studies
作者:Shreedhar Devkota、Sonaimuthu Mohandoss、Yong Rok Lee
DOI:10.1039/d1nj05715d
日期:——
In(iii)-catalyzed strategy for the preparation of 3-arylhydrazonoindolin-2-ones from 3-diazoindoles is developed and used for Fe3+ and Hg2+ ion sensing.
An efficient C–N cross-coupling approach for the synthesis of hydrazones was developed through C(sp2)–H and C(sp3)–H functionalization of indole and methylarene under visible light irradiation using photocatalyst eosin Y, ethanol:water as a green solvent and atmospheric air as an oxidant. With the aid of eosin Y, the C–H bonds of indole and methylarenes were activated followed by coupling with arylhydrazines
Isatin-phenylhydrazone derivatives and their corresponding BF2 complexes were efficiently synthesised by a three-step reaction starting from isatin and phenylhydrazine hydrochloride. The fluorescence properties of the isatin-phenylhydrazone derivatives and derived BF2 complexes were investigated in different organic solvents, in the solid state and in mixed solvent solutions of THF and H2O. These fluorescent dyes exhibited low fluorescent intensity in solution but a high fluorescent intensity as aggregates and in their solid state due to the interesting aggregation-induced emission enhancement characteristics which were caused by the inhibition of intramolecular rotation in the single molecule state. Information supporting this inference was supported by single crystal X-ray analysis. (C) 2014 The Authors. Published by Elsevier Ltd.
Isatin-phenylhydrazone dyes and boron complexes with large Stokes shifts: synthesis and solid-state fluorescence characteristics
difloroboron complexes were investigated in different organic solvents and in the solid-state. Although these fluorescent dyes exhibit feeble fluorescent intensity in solution-state, high fluorescent intensity can be detected in their solid-state. The Stokesshift of these dyes can be achieved 95–198 nm versus the typical BF2-complexes (ca. 15 nm) in the solid-state, which were caused by the remarkable