A novel fluorescent probe (dtpa-bis(cytosine)) for detection of Eu(III) in rare earth metal ions

作者：Yang, Fan; Ren, Peipei; Liu, Guanhong; Song, Youtao; Bu, Naishun^*; Wang, Jun^*

来源：Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy , 2018, 193: 357-364.

DOI：10.1016/j.saa.2017.12.038

• Rare earth metal ions
• Detection of europium (Eu3+) ion
• Fluorescent probe
• Cytosine
• Diethylenetriaminepentaacetic acid (DTPA)

In this paper, a novel fluorescent probe, dtpa-bis(cytosine), was designed and synthesized for detecting europium (Eu3+) ion. Upon addition of Eu3+ ions into the dtpa-bis(cytosine) solution, the fluorescence intensity can strongly be enhanced. Conversely, adding other rare earth metal ions, such as Y3+, Ce3+, Pr3+, Nd3+, Sm3+, Gd3+, Tb3+, Dy3+, Ho3+, Er3+,Yb3+ and Lu3+, into dtpa-bis(cytosine) solution, the fluorescence intensity is decreased slightly. Some parameters affecting the fluorescence intensity of dtpa-bis(cytosine) solution in the presence of Eu3+ ions were investigated, including solution pH value, Eu3+ ion concentration and interfering substances. The detection mechanism of Eu3+ ion using dtpa-bis(cytosine) as fluorescent probe was proposed. Under optimum conditions, the fluorescence emission intensities of Eu-III-dtpa-bis(cytosine) at 375 nm in the concentration range of 0.50 x 10(-5) mol.L-1-5.00 x 10(-5) mol.L-1 of Eu3+ ion display a better linear relationship. The limit of detection (LOD) was determined as 8.65 x 10(-7) mol.L-1 and the corresponding correlation coefficient (R-2) of the linear equation is 0.9807. It is wished that the proposed method could be applied for sensitively and selectively detecting Eu3+ ion.

• 出版日期2018-3-15
• 单位辽宁大学