A highly selective and dual responsive test paper sensor of Hg2+/Cr3+ for naked eye detection in neutral water

Addressing of multiple-metal ions on a single platform

“…Das et al [78] reported a colorimetric and fluorogenic sensor 49, sensitive toward the presence of Cr 3+ and Hg 2+ ions. In UV-vis spectrum a new red-shifted band appeared along with the corresponding color change from yellow to red upon addition of both the metal ions.…”

“…Dual-channel sensing behavior of probe 49 toward Hg 2+ and Cr 3+ ions along with the proposed binding modes[78].…”

Chromogenic ‘naked eye’ and fluorogenic ‘turn on’ sensor for mercury metal ion using thiophene-based Schiff base

“…In the absorption analysis, spectra was remain same at pH 6-10, but in more alkaline medium (pH [11][12][13][14], disappearance of the absorption band at 421 nm, which was obtained due to the intramolecular charge transfer between the Probe 1 and Hg 2+ ion, was found. All the above analysis was carried out at neutral pH.…”

Colorimetric and Highly Selective Fluorescence "Turn‐on" Detection of Cr3+ by Using a Simple Schiff Base Sensor

“…Therefore, developing new fluorescent chemosensors for rapid and convenient Cr 3＋ detection is a high demand. [2] In addition, having a paramagnetic nature which is well-known to cause fluorescence quenching and the lacking of a proper recognition moiety/ligand system for Cr 3＋ make its detection very difficult by fluorimetric methods. Therefore, only a few Cr 3＋ fluorescent chemosensors have so far been developed for either in vitro or in vivo systems.…”