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Title
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Fluorescence Chemosensory Determination of Cu2+ Using a New Rhodamine–Morpholine Conjugate
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Type
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JournalPaper
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Keywords
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chemosensor; copper; rhodamine-B derivative; environmental monitoring
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Abstract
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Abstract: A new rhodamine-B carbonyl-morpholine derivative (denoted as RECM) was prepared by a two-step synthesis procedure. The employed method allowed a lactam ring development of rhodamine-B and ethylenediamine to demonstrate a facile amide bond formation. The obtained RECM was confirmed by 1H NMR, 13C NMR, and mass spectrometry analysis. RECM was formed to detect copper ion (Cu2+) due to its problematic toxicity features in aquatic ecosystems. It showed a high selectivity toward Cu2+ in comparison with some environmentally relevant alkali, alkaline earth, and transition metal cations at 50 M in acetonitrile. Moreover, non-fluorescent RECM showed fluorescence intensity and UV-Vis absorbance increases in the presence of Cu2+ with high linear dependent coefficients (R2 = 0.964 and R2 = 0.982 respectively) as well as a color change from colorless to pink owing to the ring opening of the rhodamine spirolactam form. Binding capability experiments presented a clear 1:1 stoichiometry of RECM–Cu2+ complex with the binding constant (Ka) as 2.25 104 M
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Researchers
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Dariush Saberi (Not In First Six Researchers), Afsaneh Shahbazi (Not In First Six Researchers), Mohammad Javad Chaichi (Fifth Researcher), mahmood tajbakhsh (Fourth Researcher), akbar heydari (Third Researcher), Hbibollah Younesi (Second Researcher), Zeinab Shekari (First Researcher)
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