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Resorcinarenes were functionalized with fluorophores and fluorescence resonance energy transfer (FRET) was employed as a tool to probe the dynamic behavior of hydrogen-bonded hexameric assemblies at nanomolar concentrations. The encapsulation of a fluorescent guest inside the capsule made it possible to observe FRET across the mechanical boundary of the hexameric assembly.
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Barrett et al. (2007) studied this question.
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