Host-Guest Chemistry

Cagey coordination

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Science  21 Sep 2018:
Vol. 361, Issue 6408, pp. 1212-1213
DOI: 10.1126/science.361.6408.1212-d

Carefully chosen ratios of metal ions and bridging ligands form a wide variety of polyhedral cages in solution. Chemists often have tuned the geometry and polarity of these cages to accommodate particular molecular guests. Rizzuto et al. report a pair of larger cages that, in a similar vein, stabilize unusual coordination complexes. An initial cage with rhodium and cadmium nodes accommodated a cadmium complex coordinated by five pyrazine ligands and a water molecule. An expanded cage assembled from zinc porphyrins accommodated a rotaxane, a macrocycle threaded on an axle coordinated to the cage walls.

J. Am. Chem. Soc. 140, 11502 (2018).

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