|
Figure 3.
Figure 3. Cation-binding sites in (A) superpositioned
C[2]B-NMR structures and (B) C[2]B-B, (C) C[2]B-C, and (D)
C[2]B-D crystal structures. The Ca^2+ and Sr2+ ions are colored
orange. The oxygen atoms that coordinate the cations are colored
red. Water molecules are represented as small red spheres.
Dashed lines indicate pentagonal bipyramidyl coordination to
Ca^2+ sites (B,C) and tetragonal bipyramidyl coordination to
Sr2+ site (D) in the crystal structures.
|
