Encapsulation of Anions

A hexaamine capsule 14 is described in [51] to bind a fluoride anion in a wide range of 

Caging ligands of appropriate size and with suitable donor groups are reported in [53] to be very promising for selective encapsulation of perrhenate and pertechnetate oxoanions. In particular, polyamine capsules, the derivatives of 

Spacer fragments are slightly different in length and flexibility the sorbent 98 has a higher concentration of active sites, but its analog 99 displays higher affinity to these oxoanions and faster kinetics of their encapsulation [57], 

The protonated form of the octaamine macro-bicyclic ligand 7 encapsulates perchlorate, hydrosulfate, and hydrohexafluorosilicate monoanions 

The binding constants for this caging ligand at pH = 5.5 decrease in a guest row 

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Fig. 8.4 Encapsulation of anionic dye mole- printboard (schematic only 23 of the 64 ter-cules (green) by the dendrimer bound supra- minal adamantyl groups are shown and the molecularly to the surface of the molecular branches are symbolised)...

Onclin, S. Huskens, J. Ravoo B. J. Reinhoudt, D. N. Molecular Boxes on a Molecular Printboard Encapsulation of Anionic Dyes in Immobilized Dendrimers. Small 2005, 852-857... 

Electropolymerized films of vinyl-substituted polypyridine complexes Synthesis, characterization, and appHcations 13CCR1357. Encapsulation of anions MacrocycHc receptors based on metal coordination and anion—7T interactions 13CCR1716. 

According to MM data, the cage framework of 525 with a diameter of approximately 46 A has cuboctahedral symmetry, and its inner cavity with a diameter of approximately 23 A is decorated by 24 cationic residues allowing for multicenter interactions within the cationic microenvironment. Indeed, encapsulation of anionic guests shown in Scheme 4.30 by this spherical caging ligand has been performed. 

From a strictly topological standpoint, this family of polyoxovanadates (Figure 4.21) illustrates a very peculiar process of molecular organization in inorganic chemistry. Encapsulation of anions of molecules within shells themselves anionic in nature appears to influence and control the architecture of the system, and hence the use of the terms Template or guest-host supercomplexes, which are reminiscent of the chemistry of zeolites or of supramolecular organic chemistry (75). 

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