A Multifunctional Carbohydrazide‐Based Chromofluorescent Sensor for the Selective Detection of Cu(II) and Zn(II) Ion

Abstract

A series of multifunctional carbohydrazide based chromofluorescent sensor molecules derived from carbohydrazide, 4‐formyl‐1‐substituted phenyl‐pyrazole‐3‐carboxylate and 2‐hydroxy‐naphthaldehyde were successfully designed and synthesized. The synthesized sensor molecules exhibit significant red shift in their absorption spectra with visual color changes on interaction with Cu(II) and Zn(II) ions. In addition, the optimized sensor showed excellent selectivity towards Cu(II) and Zn(II) ions with fluorescence “turn off” and “turn on” modes respectively. Along with this, anion recognition studies were carried out using UV‐visible and fluorescence spectrophotometric titrations which revealed that synthesized sensors also exhibit selective sensing of F−, CH3COO− and H2PO4− ions via H‐bond interaction and subsequent deprotonation to elicit distinct visual color change from light yellow to orange with significant quenching in its emission intensity. Furthermore, the in‐situ prepared sensor‐anion adduct solution exhibited colorimetric “On‐Off” sensing of Cu(II) and Zn(II) ions, which was confirmed through UV‐visible titration experiments.

Recent progress in development of 2,3-diaminomaleonitrile (DAMN) based chemosensors for sensing of ionic and reactive oxygen species

“…In continuation of our research efforts on developing sensor molecules, [46][47][48][49][50][51] we synthesized hybrid chemosensors by combining diaminomaleonitrile, 4-formyl-1-substituted phenylpyrazole-3-carboxylate and 2-hydroxy-1-naphthaldehyde molecules. 52 These three moieties were joined together by imine linkages and were capable of sensing Mn 2+ and Zn 2+ ion in complex mixture through colorimetric and uorometric response.…”

A triphenylamine‐based carbohydrazide hydrazone fluorescent probe for selective detection of hypochlorite and sensing acidic gases

“…Moreover, they can selectively coordinate with molecules and cations to produce observable spectrum changes. This makes it possible to identify and detect heavy metals, pollutants, and bioendogenous molecules in the environment [27, 28]. In our previous work, we synthesized a fluorescent probe named PYCN [29] by condensation of pyrene‐1‐carbaldehyde and 2,3‐diaminomaleonitrile.…”

Tris-Triazole Based Chemosensors for Selective Sensing of Pb2+ Ions

“…The literature survey revealed the use of 1,2,3-triazole derivatives for designing of sensing materials for sensing of toxic metal ions other than mercury are still rare despite their unique structural features [24][25][26][27][28]. In continuation of our research efforts devoted to ionic recognition [29][30][31], we are reporting herein, synthesis of novel triazole derivatives (4a-c) via copper(I)-catalyzed alkyne-azide cycloaddition reaction which exhibited high selectivity and sensitivity towards Pb 2+ ions compared to other metal ions.…”