Highly selective CHEF-type chemosensor for lutetium (III) recognition in semi-aqueous media

Highly selective CHEF-type chemosensor for lutetium (III) recognition in semi-aqueous media

A simple phosphoryl quinolone (L) based sensor has been synthesized for the selective recognition of Lu3+ by spectrofluorimetric method. In methanol-water (1:1, v/v), the ligand L exhibits a weak emission peak at 400 nm upon excitation at 280 nm. Upon interaction with various f-metal and other selec...

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Bibliographic Details
Published in:Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy Vol. 214; pp. 32 - 39
Main Authors: Kumar, R. Selva, Ashok Kumar, S.K., Vijayakrishna, Kari, Sivaramakrishna, Akell, Brahmnanda Rao, C.V.S., Sivaraman, N., Sahoo, Suban K.
Format: Journal Article
Language:English
Published: Elsevier B.V 05-05-2019
Subjects:
AIE
CHEF
DFT
Fluorescent chemosensors
Lu3
Fluorescent chemosensors
CHEF
DFT
Lu3
AIE
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Summary:A simple phosphoryl quinolone (L) based sensor has been synthesized for the selective recognition of Lu3+ by spectrofluorimetric method. In methanol-water (1:1, v/v), the ligand L exhibits a weak emission peak at 400 nm upon excitation at 280 nm. Upon interaction with various f-metal and other selected metals from s, p, and d-block elements, the fluorescence of L is selectively enhanced in the presence of Lu3+ due to the chelation enhanced fluorescence (CHEF) effects. The quantum yield (φ) of L (φ = 0.063) is enhanced to φ = 0.118 upon chelation with Lu3+ ion. From the titration experiment, the limit of detection (LOD) of sensor L to recognize Lu3+ is estimated down to 24.2 nM, which is much lower than the WHO guidelines (76 μM) in drinking water. The formation of host-guest complexation between L and Lu3+ in 2:1 binding stoichiometry is studied by Job's method and the binding constant is estimated by band fit analysis (logKf = 5.1). Further, the coordination behaviour between L and Lu3+ is well supported by FT-IR, 1H NMR, 13C NMR, 31P NMR, ESI mass spectral data and the theoretical results. [Display omitted] •Developed an easy-to-synthesize phosphoryl quinolone for the selective detection of Lu3+ by spectrofluorometric method.•CHEF is the key sensing mechanism.•The LOD of the sensor is 24.2 nM which is lower than the WHO guidelines.•Sensing mechanism is well supported by FTIR, NMR, Mass and DFT studies.
ISSN:1386-1425
DOI:10.1016/j.saa.2019.02.003