Journal
NEW JOURNAL OF CHEMISTRY
Volume 42, Issue 12, Pages 10191-10201Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8nj00436f
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Funding
- University Grants Commission, New Delhi, India [PSW-155/14-15(ERO), WV6-027, 223832]
- University Grants Commission, India through Dr D. S. Kothari Post-Doctoral Fellowship (DSKPDF) [F.4-2/2006(BSR)/CH/14-15/0163]
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The high absorption coefficient, fluorescence quantum yield, photo stability and relatively long wavelengths of rhodamine dye have expanded its applicability as a promising fluorescent probe. In the present investigation, two dyes, namely rhodamine and azobenzene, have been conjugated for the detection of Al3+ in aqueous ethanol. The turn on fluorescence response of chemosensor L towards Al3+ is attributed to the inhibited PET (photo-induced electron transfer) and CHEF (chelation enhanced fluorescence) process along with the spirolactam (non-fluorescent) to ring-opened amide (fluorescent) process. The presence of the PET and CHEF process was corroborated by time-resolved photoluminescence study and the spirolactam ring opening was confirmed by C-13 NMR and infrared spectroscopy. In the presence of Al3+, the opened spirolactam ring forms a 1:1 binding complex with the metal, which is supported by its high binding constant (K-a = 7.033 x 10(3) M-1). The limit of detection (LOD) and limit of quantification (LOQ) values are found to be 1.1 x 10(-7) M and 3.6 x 10(-7) M, respectively. The reversible recognition of Al3+ was also proved in the presence of Na(2)EDTA by both UV-Vis and fluorometric titration. The sensing behaviour of the chemosensor towards Al3+ was supported by DFT/TDDFT calculations.
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