Abstract
A new highly selective and sensitive fluorescent probe for Cu2+, N-n-butyl-4-(1′-cyclooctene-1′,3′,6′-triazole)-1,8-naphthalimide (L), was synthesized and evaluated. The structure of compound L was characterized via IR, 1H-NMR, 13C-NMR and HRMS. The fluorescent probe was quenched by Cu2+ with a 1:1 binding ratio and behaved as a “turn-off” sensor. An efficient and sensitive spectrofluorometric method was developed for detecting and estimating trace levels of Cu2+ in EtOH/H2O. The ligand exhibited excitation and emission maxima at 447 and 518 nm, respectively. The equilibrium binding constant of the ligand with Cu2+ was 1.57 × 104 M−1, as calculated using the Stern-Volmer equation. Ligand L is stable and can be used to detect Cu2+ in the range of pH from 7 to 12. The sensor responded to Cu2+ rapidly and a large number of coexisting ions showed almost no obvious interference with the detection.
Highlights
Fluorescent sensors for chemical species used in biological and environmental detection are currently an attractive field of research [1,2,3]
Synthesis and Characterization incorporated into fluorophores to serve as a ratiometric fluorescent chemodosimeter for the selective
Compound L was synthesized through the route outlined in Scheme 2
Summary
Fluorescent sensors for chemical species used in biological and environmental detection are currently an attractive field of research [1,2,3]. Numerous methods to detect metal ions have been developed, such as atomic absorption spectrometry [20], inductively coupled plasma atomic emission spectroscopy [21], visual detection [22,23], chemiluminescence detection [24] and electrochemical techniques [25,26] These methods have disadvantages, such as expensive instrumentation, complicated sample preparation and tedious operating procedures, resulting in the need for other sensitive, simple detection. On theThus, transformation rapidity, nondestructive methodology and direct visual perception a number of of thiourea into guanidine derivatives, as shown in Scheme This novel compound has a highly high-performance sensors have been developed to detect metal ions [31]. ManyTable excellent chemosensors have been reported for Cu in the past few years Many of these sensors only exhibit sensitive and selective Cu2+ detection in pure organic systems.
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