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This chapter focuses on the proficiency of cucurbit[7]uril and cucurbit[8]uril (CB[7,8]) as appropriate hosts for the complexation of aromatic stimuli-responsive guests, which translates into a wide variety of switchable assemblies. These CB[7,8]-based responsive aggregates will be analysed throughout the text both on the basis of the source of external stimulation, as well as the type of structural modification produced on the complex. Hence, whilst the structural features of CB[7] would serve as a starting point for the discussion of binary host–guest switches, the ability of CB[8] to complex two identical or complementary guests would allow us to study more intricate CB[8]-based homo- and heteroternary stimuli-responsive assemblies. Great attention has been paid not only to the analysis of simplified models, but also to the implementation of these into functional chemical systems.

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