A quinazolin-based Schiff-base chemosensor for colorimetric detection of Ni²⁺ and Zn²⁺ ions and ‘turn-on’ fluorometric detection of Zn²⁺ ion

Abstract

A quinazolin based novel Schiff base chemosensor (L) has been reported for colorimetric detection of Ni2+ ion and fluorescent-colorimetric detection of Ni2+ and Zn2+ ions with minimum detection limits of 7.9 nM and 1.7 nM respectively.

A highly sensitive triazole-based perfectly water soluble novel bis-Schiff base reversible fluorescent-colorimetric chemosensor for fast detection of Pb2+ ions

“…17,18 The wide range of applications for azo compounds, especially azobenzene dyes, can be attributed to their many benets, including intense colour, simplicity in synthesis from inexpensive, easily accessible raw materials, desirable fastness properties, and special characteristics resulting from light-induced cis-trans isomerization. 19,20 In continuation of our previous [21][22][23][24][25] studies in the search of uorescent colorimetric Schiff bases, we report a novel, highly selective and sensitive optical chemosensor L based on triazole associated with azo dye for the easy onsite detection of Pb 2+ . The introduction of SO 3 H group into the exible structure resulted in an improvement of the stability and the selectivity to metal ions as well as perfect solubility in aqueous solution.…”

“…In continuation of our previous 21–25 studies in the search of fluorescent colorimetric Schiff bases, we report a novel, highly selective and sensitive optical chemosensor L based on triazole associated with azo dye for the easy onsite detection of Pb 2+ . The introduction of SO 3 H group into the flexible structure resulted in an improvement of the stability and the selectivity to metal ions as well as perfect solubility in aqueous solution.…”

A Simple and Rapid Quinoline Schiff Base as a Fluorescent Probe for Zn2+ and Its Application in Test Strips

“…The corresponding plot of fluorescence intensity versus Zn 2+ concentration was constructed, and a strong linear correlation (Y=‐81.23867+1.0517E8*X, R 2 =0.99591, Figure 3b) was observed over the range of 1~10 μM. Importantly, the remarkable limit of detection (LOD) for Zn 2+ using the rule of 3σ/slope, [40–42] was calculated to be 1.04×10 −7 M compared to the previously published probes [6,26,27,43–59] (Table 1). In addition, the association constant ( K ) for L− Zn 2+ complexation was determined by Benesi‐Hildebrand equation: $${{{{F}_{max}-{F}_{min}}\over{F-{F}_{min}}}={{1}\over{K\left[M\right]}}+1}$$ , [60] to be 3.496×10 4 M −1 (Figure S10), which confirms binding affinity of L towards Zn 2+ .…”

Tri-armed Schiff base fluorescent sensor for the rapid recognition of Zn(ii): application in live cell imaging, test strips and TLC

“…The detection of Zn(II) is also ineffective by different analytical techniques (potentiometry, cyclic voltammetry, and UVvisible techniques). [15][16][17] Therefore, scientists are becoming increasingly interested in the development of uorescent sensors for probing Zn(II) with high sensitivity and selectivity. Nowadays, this technique is extensively employed for the detection and monitoring of Zn(II) in chemical, biological (including in vitro and in vivo imaging of biological samples) and environmental systems because of its simplicity and rapidity.…”