Hydrogen bond induced fluorescence recovery of coumarin-based sensor system
摘要:
Two coumarin-type fluorescent sensors were synthesized and their fluorescence response to pH value was investigated. The fluorescence intensity of sensor 3 and sensor 4 is obviously enhanced along with the increase of pH from 7 to 12 and the reduction of pH value from 8 to 1, respectively. Possible mechanism for these fluorescence recovery systems is proposed. Intramolecular hydrogen bond could be formed under different condition, which blocks electron transferring route from nitrogen atom to fluorophore. The blue fluorescence color change of the two sensory systems could be directly detected by naked eyes under UV-lamp for pH values. (C) 2013 The Authors. Published by Elsevier Ltd. All rights reserved.
A new dual functional sensor: Highly selective colorimetric chemosensor for Fe3+ and fluorescent sensor for Mg2+
作者:Soosai Devaraj、Yao-kang Tsui、Chao-Yi Chiang、Yao-Pin Yen
DOI:10.1016/j.saa.2012.07.032
日期:2012.10
detection of Fe3+ and Mg2+ in solution as a colorimetric and fluorescentsensor, respectively. The sensor exhibited highlyselective and sensitive recognition towards Fe3+ in CH3CN via color change from colorless to brown. Also it showed a significant fluorescence enhancement (70-fold) towards Mg2+ in the mixture of solution CH3CN/H2O (8:2, v/v). The selectivity of either Fe3+ or Mg2+ was not interfered
Solvent-induced E/Z(C=N)-isomerization of imines of some hydroxy-substituted formylcoumarins
作者:V. F. Traven’、I. V. Ivanov、A. V. Panov、O. B. Safronova、T. A. Chibisova
DOI:10.1007/s11172-008-0267-5
日期:2008.9
acetonitrile, MeOH) has been studied. The solvatochromic effects observed for a number of imines, first of all, for 7-hydroxy-4-methyl-8-(4′-nitrophenylimino)methyl-2H-1-benzopyran-2-one, were related to their E/Z-isomerization with respect to the C=N bond based on the quantum chemical calculations by the AM1, PM3, PPP CI methods.