Selective fluorometric detection of F− and Zn(ii) ions by a N, O coordinating sensor and naked eye detection of Cu(ii) ions in mixed-aqueous solutionElectronic supplementary information (ESI) available: X-ray crystallographic file in CIF format for HL; Fig. S1-S12 and Table S1. CCDC 1054382. For ESI and crystallographic data in CIF or other electronic format see DOI: 10.1039/c5ra05145b
Through click chemistry, salicylaldehyde and fluorene groups have been explored to recognize anions through O-H A- hydrogen-bonding complexation followed by an ESIPT mechanism and cation sensing via CHEF and CHEQ mechanisms for Zn 2+ and Cu 2+ metal ions respectively. Herein, we demonstrate evidence...
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Main Authors | , |
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Format | Journal Article |
Language | English |
Published |
18.05.2015
|
Online Access | Get full text |
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Summary: | Through click chemistry, salicylaldehyde and fluorene groups have been explored to recognize anions through O-H A- hydrogen-bonding complexation followed by an ESIPT mechanism and cation sensing
via
CHEF and CHEQ mechanisms for Zn
2+
and Cu
2+
metal ions respectively. Herein, we demonstrate evidence of the interactions between the O-H bond and F
−
which were studied by fluorescence spectroscopic, UV-Vis spectroscopic, lifetime spectroscopic,
1
H NMR spectroscopic titrations and theoretical treatment. This sensor could simultaneously detect two biologically important metal ions (Cu
2+
and Zn
2+
) through colorimetric methods in mixed aqueous solution. The 2 : 1 binding stoichiometry ratio of the ligand and metal in the complexes was established by UV-Vis, fluorescence,
1
H NMR and ESI-MS spectroscopy, and their corresponding association constants,
K
assoc
observed at 8.13 × 10
4
and 5.12 × 10
6
M
−1
corresponds to Zn
2+
and Cu
2+
metal ions in aqueous buffer-CH
3
OH (2 : 1, v/v) at pH 7.2. In addition, the electronic structures and photo physical properties of the ligand and complexes were calculated by DFT and time-dependent DFT (TDDFT) methods.
A N, O coordinating sensor fluorogenically detects fluoride anions (
λ
ex
= 330 nm,
λ
em
= 450 nm) with blue emission and Zn(
ii
) ions with green emission (
λ
ex
= 405 nm,
λ
em
= 515 nm) as well as colorimetrically detecting copper ions. |
---|---|
Bibliography: | For ESI and crystallographic data in CIF or other electronic format see DOI 1054382 HL 10.1039/c5ra05145b Fig. S1-S12 and Table S1. CCDC Electronic supplementary information (ESI) available: X-ray crystallographic file in CIF format for |
ISSN: | 2046-2069 |
DOI: | 10.1039/c5ra05145b |