authors |
Goncalves, AC; Pilla, V; Oliveira, E; Santos, SM; Capelo, JL; Dos Santos, AA; Lodeiro, C |
nationality |
International |
journal |
DALTON TRANSACTIONS |
keywords |
AQUEOUS-SOLUTION; METAL-IONS; MERCURY; EMISSION; SENSORS; DERIVATIVES; CHROMIUM; ALUMINUM; SYSTEMS; CHEMODOSIMETERS |
abstract |
Two new luminescent compounds containing fluorescein-amino acid units have been designed and synthesized via an ester linkage between a fluorescein ethyl ester and Boc-Ser(TBDMS)-OH or Boc-Cys(4-MeBzl-OH, and their photophysical properties have been explored. The optical response of both compounds (2 and 3) towards the metal ions Na+, K+, Hg+, Ag+, Ca2+, Co2+, Ni2+, Cu2+, Zn2+, Cd2+, Pb2+, Hg2+, Al3+, Fe3+, Ga3+ and Cr3+ was investigated in pure acetonitrile and in acetonitrile/water mixtures. A strong CHEF (Chelation-Enhanced Fluorescence) effect was observed with all the trivalent metals and Hg2+ ions in both solvents. UV-vis absorption, steady state and time resolved emission spectroscopy methods were employed. The results show the formation of mononuclear complexes with Al3+, Fe3+, Ga3+, Cr3+, and Hg2+. Theoretical calculation using Density Functional Theory was performed in order to obtain atomistic insights into the coordination geometry of Al3+ and Hg2+ to the fluorescein 3, which is in accordance with the experimental stoichiometry results obtained in the Job's plot method. Among the active cations, the minimum detectable amount is under 1 mu M for most of the cases in both absorption and fluorescence spectroscopy methods. |
publisher |
ROYAL SOC CHEMISTRY |
issn |
1477-9226 |
year published |
2016 |
volume |
45 |
issue |
23 |
beginning page |
9513 |
ending page |
9522 |
digital object identifier (doi) |
10.1039/c6dt01180b |
web of science category |
Chemistry, Inorganic & Nuclear |
subject category |
Chemistry |
unique article identifier |
WOS:000378583500017
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ciceco authors
impact metrics
journal analysis (jcr 2019):
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journal impact factor |
4.174 |
5 year journal impact factor |
3.812 |
category normalized journal impact factor percentile |
90 |
dimensions (citation analysis):
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altmetrics (social interaction):
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