3 years ago

Cation–Anion Arrangement Patterns in Self-Assembled Pd2L4 and Pd4L8 Coordination Cages

Cation–Anion Arrangement Patterns in Self-Assembled Pd2L4 and Pd4L8 Coordination Cages
Philip Punt, Guido H. Clever
Compounds featuring one-dimensional regular arrangements of stacked metal complexes and alternating [cation–anion] sequences have raised considerable interest owing to their peculiar electronic and optical properties as well as guest inclusion capabilities. While traditional ways to realize these structural motifs rely on crystalline compounds, exclusively existing in the solid state, recent progress in the area of metal-mediated supramolecular self-assembly allows for the rational synthesis of structurally well-defined short stretches of stacked metal complexes and cation–anion arrangements. Therefore, metal cations, counteranions, and suitably designed organic bridges are allowed to self-assemble in solution. While the bridges can be designed as cross-linkers to yield extended two- or three-dimensional networks such as layered materials, metal–organic frameworks (MOFs), or porous coordination polymers (PCPs), they can also be tailored to lead to discrete nanoscopic objects. Supramolecular helicates, grids, and knots belong to this class of compounds, and a particularly interesting subfamily are coordination cages and capsules, which possess nanosized cavities with the ability to encapsulate guest molecules.

Publisher URL: http://dx.doi.org/10.1021/acs.accounts.7b00231

DOI: 10.1021/acs.accounts.7b00231

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