Catenanes hybrid

A hybrid bimodal [2]-catenane incorporating structural elements from the cate-nane types developed by both the Stoddart and Sauvage groups in the one system... 

Fig. 6 Class C SPs. 14 Polyrotaxane " " 15 poly[2]catenane 18 linear dendritic hybrid chain from 7-oxanorbornene monomers substituted with two tapered monodentrons " and 20 SAMs of n-alkanethiolates on gold. Structures 16 [3]catenane and [3] rotaxane with two dibenzol[24]crown-8 rings 17 a-cyclodextrin 4-poly (ethylene oxide) and 19 tobacco mosaic virus are included for comparison.

Sauvage, Stoddart, and coworkers reported a hybrid [2]catenane (Figure 17) based on the integration of transition metal cooordination and 7r-elctron donor-acceptor... 

Limitations on the application of hydrogen bonded capsular assemblies come from the poor stability of these assemblies in polar media compared to those held by covalent bonds. In an attempt to overcome these Umitations, Bohmer described the synthesis of a mechanically locked chiral bis-catenane based on calixarene capsules [55]. Inspired by this pioneering work, our group produced a mechanically locked hybrid tetraurea calix[4]arene-calix[4]pyrrole capsule 30 (Fig. 32.14) [56]. This catenated capsule displayed reversible encapsulation (i.e. reversible assembly of the urea belt). The two hemispheres of the capsule never dissociate completely due to the bis-catenated topology. 

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