A new squaraine based chemosensor TSQ was developed for colorimetric detection of Fe ions. A thymine moiety in TSQ was constructed to act as an ion acceptor. The sensor displayed an instant colorimetric response specific to Fe over the other metal ions in 20% AcOH-HO solution. The limit of detection was much lower than that of the environmental protection agency guideline (5.37 μM) in drinking water. A 1 : 1 binding between TSQ and Fe ion was evidenced by Job's plot measurement, ESI-MS and Fourier transform infrared (IR) measurements. Moreover, the proposed sensing mechanism of the receptor towards Fe was strongly supported by DFT calculation. Finally, the sensor has proven to be suitable in real sample applications.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9087219 | PMC |
| http://dx.doi.org/10.1039/c8ra07345g | DOI Listing |
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