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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 44. Bis-calix[4]pyrrole 88 and single crystal structures of its anion complexes.

Figure 44

(A) Molecular structure of receptor 88.

(B) The crystal structure of the complex [(H2PO4)2 (H2O)]2− ⊂ 88.

(C) The crystal structure of the complex [(SO4)2 (H2O)2]4− ⊂ 88.

(D) The crystal structure of the complex [(H2P2O7)2]4− ⊂ 88.

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

Taken from He et al.129 and reproduced with permission. © 2017 American Chemical Society.