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(a) Complexation of K+ by 1. The depiction on the right is from the x-ray crystal structure. (b) Cation-π complexes observed in the solid state structures of 1-3. (c) Electrostatic potential surface for benzene (Top) and hexafluorobenzene (Bottom). (d) Complexation of K+ by 4. (e) Comparison of the solid state structures of 1⋅KI (Top) and 4⋅KI (Bottom).
