On or off? A new excimer band at lambda = 570 nm was visualized during the noncovalent host-guest interaction between thioflavin T (ThT) and cucurbit[8]uril (CB8). Controlled dissociation of this assembly in the presence of Ca(2+) was demonstrated as an on/off fluorescence switch (see picture).
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Mohanty et al. (2009) studied this question.
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