A flexible Schiff base probe for spectrophotometric detection of chromium (III)
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A new Schiff base chemosensor (2,2′-(1E,1′E)-(hexane-1,6-diylbis(azan-1-yl-1-ylidene))bis(methan-1-yl-1-ylidene)diphenol) was synthesized (denoted as C6) and characterized by NMR, ESI–MS and FTIR analysis. C6 was screened against several toxic and hazardous materials including heavy metals via spectrophotometry, and Cr+3 was found to produce a distinctive hyperchromic shift in the absorbance of C6. Further analytical evaluation to decipher the supramolecular interaction between C6 and Cr+3 showed that C6 acted as selective chemosensor and exhibited high sensitivity toward Cr+3 in the presence of a wide range of other metal ions. The limit of detection for Cr+3 by using C6 via spectrophotometric detection was found to be around 10 µM. Furthermore, a chemosensing protocol was successfully utilized to recognize Cr+3 in real samples of tap water. Hence, C6 provides a rapid, sensitive and robust method for the detection and possible removal of Cr+3 from aqueous solution and holds potential for its monitoring in the environment.
KeywordsChemosensor Cr+3 Schiff base Spectrophotometry Supramolecular Metal recognition
The authors gratefully acknowledge the financial support from Higher Education Commission, Pakistan (Case No. 106-2077-PS6-065) and H.E.J. Research Institute of Chemistry, International Centre for Chemical and Biological Sciences, University of Karachi, Pakistan.
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
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