The binding interactions between SQ2 squaraine dye and cucurbit[8]uril (CB8) effectively removes the aggregation of SQ2 in aqueous solution by forming a 1 : 1 inclusion complex. The resulting SQ2.CB8 complex exhibits highly selective fluorescence quenching by Hg(2+) ions, as a result of the synergetic binding between CB8, SQ2 and metal cation.
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Xu et al. (2010) studied this question.
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