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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 12. Acyclic bis-urea receptors and their anionic dimer complexes.

Figure 12

(A) Molecular structures of receptors 25 and 26.

(B) Single crystal X-ray structure of the complex [(H2PO4)6]6− ⊂ 252.

(C) Single crystal X-ray structure of the complex [(H2PO4)6]6− ⊂ 262.

(D) Single crystal X-ray structure of the complex [(H2PO4)4]4− ⊂ 252.

All anions encapsulated within the cavity are shown in space-filling form. Color code: C = gray, N = blue, O = red, and P = yellow. The counter cations and other molecules outside the cavities are omitted for clarity.