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[en] 2-Hydroxy-1-naphthaldehyde oxime (receptor 1) serves as a selective chemosensor for cyanide anion (CN"−). In the presence of CN"−, an enhanced fluorescent intensity and red-shift were observed. The observed complexation between receptor 1 and CN"− may cause by a hydrogen bonding interaction between the OH group of receptor 1 and CN"−. - Highlights: • 2-Hydroxy-1-naphthaldehyde oxime serves as a selective chemosensor for CN"−. • In the presence of CN"−, an enhanced fluorescent and red-shift were observed
[en] A simple Schiff-base fluorescent receptor 1 was synthesized in an one step procedure. Receptor 1 displayed a selective colorimetric change (from light yellow to light green) and high ratiometric signals upon binding to Al3+ in EtOH solution. The association constant for 1–Al3+ in EtOH was determined as 2.08×106 M−2 and the detection limit for Al3+ was determined as 5.21×10−7 M. The detection limit was sufficiently low to detect submicromolar concentration of the Al3+. - Highlights: • A new Al3+ receptor can be easily prepared. • The receptor exhibits an “off-on-type” mode with high selectivity in the presence of Al3+. • Receptor 1 could serve as selective and efficient colorimetric sensor for the detection of Al3+ by naked eye method
[en] A simple quinoline derivative (quinoline-base sensor) was synthesized and investigated by its sensing properties towards various metal ions in CH3CN. Quinoline-base sensor showed a highly selective fluorescent enhancement towards Mg2+. The association constant of a 1:1 complex between quinoline-base sensor and Mg2+ was determined as 1.91×107 M−1. The detection limit of quinoline-base sensor for the analysis of Mg2+ ion was determined as 19.1 ppb; this value is below the maximum permissible level for drinking water.
[en] A simple boronic acid derivative was utilized as a reaction-based receptor for CN− in aqueous solution. The receptor showed a selective and sensitive response to CN− over other various anions via nucleophilic addition of CN− to the imine moiety of the boronic-based receptor.
[en] A simple colorimetric and turn-on fluorescence receptor RN (Rhodamine-based derivative) was prepared and its cation-sensing properties were investigated. Receptor RN displayed a selective sensing of Hg2+ and showed an obvious colorimetric changing in aqueous solution (from colorless to pink color) and in the solid state (from red to pink color), respectively. The association constant of RN-Hg2+ complex was calculated to be 8.25×109 M−2, and the detection limit for Hg2+ was found to be 27 ppb.
[en] A multifunctional Schiff base fluorescent sensor (receptor L) was prepared and its metal ions and anions sensing properties were investigated. Receptor L exhibited an excellent selective fluorescence response toward Fe2+ and F−. It also showed colorimetric response (from colorless to yellow) toward Fe3+ among a series of ions. Moreover, the detection limits of receptor L for Fe2+ and F− were determined to be 0.3 ppm and 25.7 ppb, respectively. The two detection limit values were sufficiently low to detect nano-molar concentration of Fe2+ and F−.