Abstract
The host–guest interaction between tetramethylcucurbit[6]uril (TMeQ[6]) and 2-(4-methoxyphenyl)-1H-imidazo[4,5-f][1,10]phenanthroline hydrochloride salt (guest 1) has been investigated. 1H NMR results have confirmed the formation of an encapsulated complex, and fluorescence titration implies an interaction ratio of 1:1 with a moderate association constant of Ka=4.0×106Lmol−1. The triggered fluorescence emission of guest 1 by TMeQ[6] has been developed to achieve a supramolecular probe capable of recognizing La3+ and Ce3+ through a dramatic decrease in fluorescence intensity, whereas there is minimal difference upon the introduction of Pr3+, Nd3+, Sm3+, Eu3+, Gd3+, Tb3+, Dy3+, Er3+, or Tm3+. Combined evidence from 1H NMR, IR, and fluorescence titration supports coordination of the inclusion complex to La3+ and Ce3+, with association constants of 1.1×104Lmol−1 and 1.0×104Lmol−1, respectively. The linear decrease in fluorescence intensity in response to different concentrations of La3+ or Ce3+ gives a low limit of detection (LOD) of 1.1×10−8molL−1.
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