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. Author manuscript; available in PMC: 2019 Jan 11.
Published in final edited form as: Chem. 2017 Dec 14;4(1):46–93. doi: 10.1016/j.chempr.2017.10.015

Figure 10. Acyclic bis-urea receptors and their anionic dimer complexes.

Figure 10

(A) Molecular structures of receptors 21 and 22.

(B) Single crystal X-ray structure of the complex [(CO3)2(H2O)2]4− ⊂ 214.

(C) Single crystal X-ray structure of the complex [(SO4)2]4− ⊂ 214.

(D) Single crystal X-ray structure of the complex [(SO4)2]4− ⊂ 224.

All anions encapsulated within the cavity are shown in space-filling form. Color code: C = gray, N = blue, Cl = green, S = yellow, and Br = brown. The counter cations and solvent molecules outside the cavities are omitted for clarity.