Colorimetric Detection of Copper(II) Ions Using Schiff‐Base Derivatives

Abstract

Two new Schiff base derivatives N,N-dimethyl-4-((2-(phenylthio) phenyl)imino)propenyl)aniline (CSP) and 2-(4-(dimethylamino) phenyl) allylidene) amino)benzenethiol (CSH) were synthesized. Sensing mechanism of the sensors was investigated using UV-Vis spectroscopy in the presence of various metal ions. The sensor CSP shows high sensitivity and selectivity to Cu 2 + over a wide range of other metal ions in acetonitrile (ACN)/water (H 2 O) (v/v 2 : 1). The sensor CSP can detect Cu 2 + ions by color change from yellow to pink. The complex stoichiometry between the sensor, CSP, and Cu 2 + was found to be 2 : 1 and the binding constant was calculated to be 2.40 × 10 10 M À 2. The absorbance detection limit of CSP for Cu 2 + was determined as 2.85 × 10 À 6 M. The sensor, CSP, was also applied to real samples successfully.

Metallochromic Hydrazone‐Based Chemosensor with Application in a Colorimetric Paper Strip for Selective Detection of Cu2+

“…L* was highly decreased upon raising the total content of the copper ions to indicate the formation of darker color. a* was increased and switched from negative to positive values [32][33][34] Many colorimetric chemosensors have been developed for detection of copper ions, such as Schiff-Bases, [35] pyrenes, [36] chromones, [37] and metal-organic frameworks. [38] However, these chemosensors have shown disadvantages, such as sophisticated and expensive preparation procedures, poor selectivity, lower limit of detection, and difficult to operate under ambient conditions.…”

Highly Sensitive and Selective Spiropyran-Based Sensor for Copper(II) Quantification

“… 28 , 34 − 87 Some designs that have been explored include chemosensors based on rhodamine 44 , 53 , 56 , 57 , 60 , 78 and Schiff-base units. 28 , 37 , 45 , 48 , 51 , 54 , 61 , 62 , 70 , 71 , 76 , 77 It is evident that while there have been many copper sensor designs, sensitivity and selectivity for naked-eye detection remain elusive. For example, of the 55 sensors mentioned above, only 14 sensors displayed naked-eye detection below 10 μM.…”

“…For example, of the 55 sensors mentioned above, only 14 sensors displayed naked-eye detection below 10 μM. 34 , 42 , 44 , 50 , 53 , 57 , 61 , 65 , 66 , 69 , 70 , 72 , 76 , 87 Furthermore, only three of the studies challenged copper sensing in the presence of a competing metal ion 34 , 61 , 70 and none challenged copper sensing in the presence of 10-fold excess competing metal to copper, which is achieved in this work.…”

“…Small-molecule copper-ion sensors that produce optical signals are of great interest and we have identified 55 colorimetric and fluorescent copper sensors that have been reported in the literature in 2010. ,− Some designs that have been explored include chemosensors based on rhodamine ,,,,, and Schiff-base units. ,,,,,,,,,,, It is evident that while there have been many copper sensor designs, sensitivity and selectivity for naked-eye detection remain elusive. For example, of the 55 sensors mentioned above, only 14 sensors displayed naked-eye detection below 10 μM. ,,,,,,,,,,,,, Furthermore, only three of the studies challenged copper sensing in the presence of a competing metal ion ,, and none challenged copper sensing in the presence of 10-fold excess competing metal to copper, which is achieved in...…”

Sulu Çözeltilerde Hg2+ Tespiti için Sinnamaldehit Türevi Bir Kolorimetrik Sensör

“…Recently, some interesting Schiff base derivatives have been synthesized. Specifically, cinnamaldehyde-based Schiff base derivatives have been reported for the monitoring of metal ions such as Cu 2+ (Aydin and Keles, 2020a), Cd 2+ (Aydin and Keles, 2020b), Ag + (Kang et al, 2018), Ni 2+ (Peralta-Dominguez et al, 2015), Al 3+ (Kar et al, 2015: Aydin andKeles, 2017) Cu 2+ /Hg 2+ (Cho et al, 2019).…”