Porous Capsules {(M)M5}12FeIII30 (M=MoVI, WVI): Sphere Surface Supramolecular Chemistry with 20 Ammonium Ions, Related Solution Properties, and Tuning of Magnetic Exchange Interactions


  • We thank Prof. Pierre Gouzerh (Paris) for discussions. A.M. and T.G. acknowledge continuous financial support by the Fonds der Chemischen Industrie and the Deutsche Forschungsgemeinschaft (in the framework of Forschergruppe FOR945 “Nanomagnets”). Work at the Ames Laboratory was supported by the Department of Energy, Basic Energy Sciences, under Contract No. DE-AC02-07CH11358. T.L. acknowledges support from the National Science Foundation (CHM0723312).


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A manifold of hydrogen-bonding options on a highly active, functionalized capsule surface exhibiting 20 crown ether type pores allows the fixation and recognition of 20 ammonium cations (see picture; W green, Fe orange, O red, N blue, H light gray), which are partially released in solution, thereby leading to related equilibria.