Fluorescent sensors based on controllable conformational change for discrimination of Zn2+ over Cd2+

A Coumarin–based Colorimetric and Fluorescent Chemosensor for the “Naked–eye” Detection of Fluoride ion in 100 % Natural Water Medium Using Coated Chromatography Plates

“…UV‐vis absorption spectra titration was carried out at room temperature with tetrabutyl ammonium (TBA) salts of the respective anions to investigate the selectivity of CL towards F – . As displayed in Figure , the free CL showed a strong intramolecular charge transfer absorption peak centered at 400 nm in DMSO/H 2 O (9/1, v/v, pH=7.0) solution, which is the typical absorption band of coumarin dyes . On increasing in the concentration of F – (0–35 μM), the maximum absorption band of CL centered at 400 nm was gradually reduced, concomitantly a new absorption band appeared at 500 nm due to the hydrogen binding interaction between the N–H of the amide and amine groups of CL and F – .…”

Design of turn-on fluorescent probe for effective detection of Hg2+ by combination of AIEE-active fluorophore and binding site

“…The potential application of 1 as a probe for the detection of metal ions was evaluated, due to its intrinsic forcipate binding sites [55]. A c c e p t e d M a n u s c r i p t 17 had been further confirmed by Job's plots study (Fig.…”

Restriction of Molecular Twisting on a Gold Nanoparticle Surface

“…[35,36] This was followed by reaction with DMF/POCl 3 that introduces ac hloro group in conjugation with the aldehyde group 4. The formylcoumarin compound 4 was prepared in two steps starting from DEMAP aldehyde 1 and ethyl cyanoacetate 2 in ethanol using piperidine to obtain acetyl coumarin intermediate 3.…”

“…The formylcoumarin compound 4 was prepared in two steps starting from DEMAP aldehyde 1 and ethyl cyanoacetate 2 in ethanol using piperidine to obtain acetyl coumarin intermediate 3 35. 36 This was followed by reaction with DMF/POCl 3 that introduces a chloro group in conjugation with the aldehyde group 4 10. The chromophore and intermediates were characterized by 1 H NMR, 13 C NMR, mass spectrometry.…”