Selective naked-eye detection of Magnesium (II) ions using a coumarin-derived fluorescent probe

A new coumarin based dual functional chemosensor for colorimetric detection of Fe3+ and fluorescence turn-on response of Zn2+

“…On the other hand, the aromatic protons signal at 8.79, 8.44, 8.1, 7.87, 7.65 ppm were shifted upfield to 8.54, 8.06, 7.76, 7.53, 7.38 ppm while the other signals at 8.6, 7.79, 7.68, 7.61 ppm were shifted downfield to 8.63, 8.73, 8.33, 8.23 ppm in presence of Zn 2+ ion, respectively. These spectra exhibited the binding nature of H 10 L withZn 2+ ion in 1:1 stiochiometric ratio[68,69]. Moreover, these overall changes in the chemical shifts of the proton in presence of Zn 2+ ions suggested that the binding of H 10 L to Zn 2+ forms a rigid system by a strong complexation with H 10 L via O-H and N heteroatoms.…”

A novel optical sensor for copper ions based on phthalocyanine tetrasulfonic acid

“…The band gap energy (Eg = 1240/ ) at the corresponding wavelength was found around 1.755 eV (for PCTS) and 1.774 eV (for PCTS + Cu 2+ ). HOMO (higher occupied molecular orbital) energy level (for PCTS is −5.456 eV, for PCTS + Cu 2+ is −6.293 eV) was estimated with DPV [40][41][42][43][44][45][46][47][48][49][50][51][52][53][54]. LUMO energy levels were estimated from HOMO and optical band gap energies (for PCTS is −3.701 eV, for PCTS + Cu 2+ is −4.523 eV) (Fig.…”

Magnetic ionic liquid assisted single‐drop microextraction of ascorbic acid before its voltammetric determination

“…Thus, a microextraction step before the electrochemical determination of AA can be helpful. Electrochemical techniques have shown their potential for the quantification of different species .…”