Sie befinden Sich nicht im Netzwerk der Universität Paderborn. Der Zugriff auf elektronische Ressourcen ist gegebenenfalls nur via VPN oder Shibboleth (DFN-AAI) möglich. mehr Informationen...
Dual-Channel More Flexible Salamo-Like Chemosensor for Fluorogenic Sensing of Copper Ion in Semi-Aqueous Medium
Ist Teil von
Journal of applied spectroscopy, 2022, Vol.89 (1), p.177-185
Ort / Verlag
New York: Springer US
Erscheinungsjahr
2022
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
The optical properties of the symmetric salamo-like chemical probe (H
2
CS) of Cu
2+
were studied in EtOH/H
2
O (1:1, v/v) solution by UV-Vis and fluorescence spectroscopy. In the fluorescence spectrum, the coordination of Cu
2+
with H
2
CS results in fluorescence quenching owing to the paramagnetic nature of Cu
2+
ions. The binding constant of Cu
2+
to the H
2
CS sensor was calculated as 1.17 × 10
11
M
–1
and LOD was obtained as 5.3 × 10
–8
M. When Cu
2+
ions were added, the UV-Vis spectra changed, obviously due to the electron transfer from sensor to metal bond, and a new absorption band appeared at 372 nm. When the ethylenediaminetetraacetic acid (EDTA) solution was added to the H
2
CS–Cu
2+
solution, causing a large binding constant, with EDTA releasing the free sensor molecule and finally achieving a fluorescence shutdown phenomenon.