Self‐assembly of anion‐binding supramolecular cage complexes

Metallo-supramolecular capsules

“…Ward and co-workers have used approaches similar to some of those described for the formation of catenanes and molecular knots in the book chapter mentioned at the start of this section [11,[28][29][30][31][32][33][34][35][36]. The authors report on a series of ligands containing different numbers of N,N-bidentate chelating arms that are combined with various transition metals to form a library of metal-organic cage complexes that are based on different polyhedra.…”

“…The authors report on a series of ligands containing different numbers of N,N-bidentate chelating arms that are combined with various transition metals to form a library of metal-organic cage complexes that are based on different polyhedra. Variation in the distance between the N,N-bidentate chelating arms by means of organic modification results in changes in cage complex formation, and the voids within these assemblies are filled with the appropriate anion depending on the metal salt employed [28][29][30][31][32][33][34][35][36]. Recently, the authors have reported the formation of two polyhedral cage complexes that are either homoleptic or heteroleptic with respect to ligand composition [36].…”

“…In the broad topic of this section, transition metals are often used for templating, and significant advances in large superstructures or clusters have been made by Fujita and coworkers [12][13][14][15][16][17][18], Stang and co-workers [19,20], Raymond and co-workers [21][22][23][24][25][26][27] and Ward and co-workers [28][29][30][31][32][33][34][35][36]. Fujita has reacted pyridyl or pyrimidyl functionalised planar or near planar ligands (that are typically triangular) with cis-protected palladium in order to synthesise a substantial series of metalorganic cages [12][13][14][15][16][17][18].…”

Host‐Guest Chemistry of Truncated Tetrahedral Imine Cages with Ammonium Ions

“…Comparisons of the host-guest complexes with the ammonium salts by 19 F-NMR spectroscopy showed no significant shifted peak for the BF 4 -counteranion, like it was found in other works. [32] Furthermore, by 1 H- 19 F HOESY experiments no coupling of fluorine with any of the cage protons was found (see Supporting Information), suggesting that the anion is not bound inside the cavities. This is in agreement with the obtained crystal structure of the (NPr 4 + ·toluene�3-H)BF 4 complex (see discussion above).…”

Nickel(ii) and iron(ii) triple helicates assembled from expanded quaterpyridines incorporating flexible linkages

“…1b). The ESI-HRMS of this material revealed +2 and +3 ion species corresponding to successive losses of PF 6 -from the formula [Fe 2 (6) 3 ](PF 6 ) 4 (while much less intense peaks were also present corresponding to the successive loss of PF 6 -ions from the formula [Fe 4 (6) helicate or meso structures (as well as a dinuclear structure of this stoichiometry incorporating two terminally coordinated 6 ligands and one bridging 6 ligand) 15 in which two ligands are in one environment and one is in another. The most probable rationale for the observed NMR data appears to be that the product is ã 1 : 1 mixture of the corresponding (isomeric) triple helicate and meso-helicate.…”