A Cationic Guest in a 24⁺ Cationic Host

Abstract

A new tetrahedral coordination cage M12L6 was prepared from a linear dipyrimidine ligand (L) and cis-protected palladium(II) (M). This cage showed unprecedented host-guest chemistry where the cationic host accommodated a cationic guest despite 24+ charges on the host framework. The unusual cation-cation host-guest chemistry is described by a unique onionlike shell structure of the host-guest complex where two cationic spheres are mediated by an anionic sphere of a counteranion assembly.

Metallasupramolecular architectures, an overview of functional properties and applications

“…6), could even host one cationic guest molecule NBu 4 + , upon exposure to an excess of [NBu 4 ](BF 4 ). 15 The host-guest complex could be seen as a triple-layer onion-like structure, in which an anionic sphere of BF 4 − ions is mediated between cationic host and guest. No encapsulation was observed in absence of BF 4 − , indicating a clear role of the anion in the encapsulation process.…”

Ion‐Pair Recognition by Ditopic Macrocyclic Receptors

“…[17,18] In some cases, the assembled aggregate is large enough to act as a capsule and completely encapsulate both ions of the salt. [19] A related design is the so-called "venus fly trap" capsule. An example of this design was recently reported by Atwood and coworkers, who showed that an extended, deep-cavity resorcinarene derivative can completely encapsulate a NMe 4 + cation with a Cl -anion positioned by hydrogen bonding at the capsule entrance (see schematic receptor 12).…”

Crystal Structure of an 8-Shaped Discrete Porous Complex, [Cu2L2(DMF)2] 2DMF, H2L = 2,4-bis[(2'-carboxyphenoxy)methyl]-1,3,5-trimethylbenzene

“…3 Here, we report an 8-shaped discrete porous Cu(II) supramolecule constructed by a derivative of salicylic acid and Cu(AcO)2. All chemicals used were of analytical regent grade and were used directly without further purification.…”