A New Probe for Ca2+ Based on the Rhodamine B Amide Armed Homotrioxacalix[3] Arene-Sb3+ Complex
ZHANG Wen-juan, WU Chong, ZENG Xi, MU Lan*, XUE Sai-feng, TAO Zhu
Key Laboratory of Macrocyclic and Supramolecular Chemistry of Guizhou Province, College of Chemistry and Chemical Engineering, Guizhou University, Guiyang 550025, China
Abstract：A new fluorescence probe based on the rhodamine B amide-armed homotrioxacalix[3]arene (1) has been synthesized, and its Ca2+-selective chromogenic properties were investigated in acetonitrile Tris-HCl buffer (pH 7) solution by UV-Vis and fluorescence spectroscopies. Upon the addition of Sb3+ ion, the spirocyclic ring of 1 was opened and a significant fluorescence enhancement and colorimetric change was observed. However, addition of Ca2+ ion to the solution of 1-Sb3+ complex leads to a strong fluorescence quenching of the original 1-Sb3+ complex. The phenomenon exhibited a pronounced Ca2+ selective fluoroionophoric behavior over other coexistent metal ions and provided the ratiometric determination as well as naked-eye detection of Ca2+ ions.
Key words：Rhodamine B;homotrioxacalix[3]arene;Fluorescence and colorimetric probe;Sb3+;Ca2+
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