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. 2011 Aug 16;133(35):14136–14148. doi: 10.1021/ja205884y

Figure 2.

Figure 2

X-ray crystal structures of 5, 7, and 8 with a variety of anionic guests. Ligands are represented as wireframes, and bound anions are shown in a spacefilling view (0.6 times van der Waals radius). Solvent molecules, counterions, and noninteracting hydrogens are omitted for clarity: C (gray), H (white), N (blue), S (yellow), O (red), F (green), Cl (dark green), P (orange). Hydrogen bonds are represented by dashed lines. (a) Free ligand 7; (b) 7⊃Cl; (c) (7)2⊃SO4 (disordered sulfate); (d) 8⊃SO4·TBA; (e) (5)2⊃CO3; (f) (8-H)2; (g) (7)2⊃HPO4 (disordered hydrogen phosphate); (h) (8⊃NO3)2.