4 years ago

A Highly Selective and Sensitive Fluorescent Turn-Off Probe for Cu(2+) Based on a Guanidine Derivative.

Fei Ye, Ming-Qiang Li, Qiong Chai, Xiao-Min Liang, Ying Fu, Zhi-Qiang Wang
A new highly selective and sensitive fluorescent probe for Cu(2+), 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, (13)C-NMR and HRMS. The fluorescent probe was quenched by Cu(2+) 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 Cu(2+) in EtOH/H₂O. The ligand exhibited excitation and emission maxima at 447 and 518 nm, respectively. The equilibrium binding constant of the ligand with Cu(2+) was 1.57 × 10⁴ M(-1), as calculated using the Stern.

Publisher URL: http://doi.org/10.3390/molecules22101741

DOI: 10.3390/molecules22101741

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