2024 : 7 : 23
mahmood tajbakhsh

mahmood tajbakhsh

Academic rank: Professor
Education: PhD.
Faculty: Faculty of Chemistry
Address: /Faculty of chemistry- University of Mazandaran- Babolsar- Iran
Phone: 09111146981


Fluorescence Chemosensory Determination of Cu2+ Using a New Rhodamine–Morpholine Conjugate
chemosensor; copper; rhodamine-B derivative; environmental monitoring
Journal Chemosensors
Researchers Zeinab Shekari ، Hbibollah Younesi ، akbar heydari ، mahmood tajbakhsh ، Mohammad Javad Chaichi ، Afsaneh Shahbazi ، Dariush Saberi


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