Abstract
A novel fluorescent polymer with pendant triazolyl coumarin units was synthesized through radical polymerization. The polymer showed reasonable sensitivity and selectivity towards Cu2+ in acetonitrile in comparison to other tested metal ions with a significant quenching effect on fluorescence and blue shifting in the range of 20 nm. The blue shift was assigned to the conformation changes of the diethylamino group from the coumarin moiety which led to planarization of the triazolyl coumarin units. The possible binding modes for Cu2+ towards the polymer were determined through the comparison of the emission responses of the polymer, starting vinyl monomer and reference compound, and the triazole ring was identified as one of the possible binding sites for Cu2+. The detection limits of the polymer and vinyl monomer towards Cu2+ were determined from fluorescence titration experiments and a higher sensitivity (35 times) was observed for the polymer compared with its starting monomer.
Highlights
The cupric ion (Cu2+ ) is considered as one of the trace elements in human and other mammal systems due to its essentiality and very limited quantities in the body [1,2]
Typical methods that have been developed and employed for the detection of copper ions are mainly based on atomic absorption spectroscopy (AAS) [8], inductively coupled plasma-mass spectroscopy (ICP-MS), inductively coupled plasma-atomic emission spectroscopy (ICP-AES) [9], and electrochemical sensing methods [10,11]
The synthesis was accomplished in five steps from
Summary
The cupric ion (Cu2+ ) is considered as one of the trace elements in human and other mammal systems due to its essentiality and very limited quantities in the body [1,2]. Typical methods that have been developed and employed for the detection of copper ions are mainly based on atomic absorption spectroscopy (AAS) [8], inductively coupled plasma-mass spectroscopy (ICP-MS), inductively coupled plasma-atomic emission spectroscopy (ICP-AES) [9], and electrochemical sensing methods [10,11]. These techniques are costly, extremely tedious and destructive. Emission studies of the starting vinyl monomer and a reference coumarin-based molecule in the presence of Cu2+ were used to investigate the binding mode of P1 towards Cu2+
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