Determination of Fe²⁺ and Co²⁺ by a Multiple‐Target Colorimetric Chemosensor with Low Detection Limit in Aqueous Solution

Abstract

A highly effective colorimetric chemosensor DPKP, N'-(di (pyridin-2-yl)methylene)-6-hydroxypicolinohydrazide, was synthesized. DPKP sensed Fe 2 + and Co 2 + with the changes of color from colorless to blue and yellow, respectively, without severe inhibition from other metal ions. Binding interactions of DPKP with Fe 2 + and Co 2 + were analyzed to be 1:1 and 2:1 with Job plot and ESI-MS analyses, respectively. In particular, DPKP has low detection limits for Fe 2 + (0.60 μM) and for Co 2 + (0.22 μM).In addition, DPKP could be used for quantification of Fe 2 + and Co 2 + in environmental samples.[a] H.

Recent advances in the fluorimetric and colorimetric detection of cobalt ions

“…Hence, 14 could be used for the efficient detection of Co 2+ in water samples. 41 Chemosensor isatin-3-phenylhydrazone 15 was prepared by dissolving phenylhydrazine in a suspension of isatin in 10 mL of ethanol. The completion of the reaction was checked by TLC and the final product was obtained in the form of a yellow solid.…”

Multifaceted Chiral Probe 2,3-Dihydro-4-hydroxy-chromene Schiff Base in Detecting Cu2+ Ions, l-Histidine, and Indazole: Spectroscopic Investigation and Confocal and Live Cell Imaging

“…Hence, suitable sensors have to be developed for the detection of copper ions (Cu­(I)/Cu­(II)) in organic and environment samples. Generally, the increased level of copper ions causes numerous degenerative diseases like cancer, epilepsy, hepatitis, Parkinson, and Alzheimer. − In this turn, metal ions (copper) can be detected by various techniques such as electrothermal atomic absorption (EAS), flame atomic absorption (FAAS), and inductively coupled plasma mass spectrometry (ICP-AES). − Up to date, several chemosensors for detection of Cu­(II) have been reported. − …”

A Unique Thiosemicarbazide‐Based Colorimetric Chemosensor for Fe2+ in Pure Aqueous Solution with the Lowest Detection Limit

“…As an alternative of these methods, a colorimetry has attractive advantages of high selectivity, sensitivity, simplicity, convenient procedure and quick analysis time . Hence, the colorimetry has drawn much attention and many colorimetric chemosensors have been reported for detecting Fe 2+ or Fe 3+ or both of them . However, selective colorimetric chemosensors for only Fe 2+ were very rare, and in pure aqueous solution, only four colorimetric chemosensors for Fe 2+ were reported, based on pyridine, picoline, cap‐type, and terpyridine .…”