A novel colorimetric and fluorescent probe for trivalent cations based on rhodamine B derivative

作者：Yue, Xiao-li; Li, Chao-rui; Yang, Zheng-yin^*

来源：Journal of Photochemistry and Photobiology A: Chemistry , 2018, 351: 1-7.

DOI：10.1016/j.jphotochem.2017.10.005

• Fluorescent probe
• Colorimetric
• Rhodamine B
• Ring-open
• Trivalent cations
• Reversibility

A novel Schiff-base (HL) based on rhodamine B derivative was designed and synthesized as a highly selective and sensitive "turn-on" fluorescent probe for M3+ (Cr3+, Fe3+, and Al3+) in methanol. Upon addition of M3+, the spirolactam ring (colorless and nonfluorescent) of HL was opened to the ring-open forms (pink and orange-yellow fluorescence). These results indicated that HL could be used as a colorimetric and fluorescent probe for the detection of M3+ with low detection limit of 0.63 mu M (Cr3+), 0.14 mu M (Fe3+), and 0.22 mu M (Al3+). The binding constant (Ka) of M3+ binding to HL were calculated to be 0.87 x 10(4)M(-1) (Cr3+), 1.14 x 10(4)M(-1) (Fe3+), and 4.48 x 10(4)M(-1) (Al3+), respectively from a Benesi-Hildebrand plot. The binding stoichiometry between HL and M3+ was determined from the Job's plot (fluorescent spectrum) and ESI-MS spectrum data to be 1:1. Furthermore, the recognition process of the probe for M3+ was chemically reversible on the addition of fluorinion (F-).

• 出版日期2018-1-15
• 单位功能有机分子化学国家重点实验室; 兰州大学