Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Solvent-accessible iso-surface overlaid on X-ray crystal structures of (FeII)5-coordinated pentafoil knot 2 (left)4a and (FeII)6-coordinated Star of David link 3 (right)9c shown from above (top) and from the side (bottom). The structure dimensions (yellow double-headed arrows) and the diameters of the cavity (red) are shown. A 1H radius of 1 Å, a typical value for hydrogen-bonding H atoms,20 was assumed for distance measurements (see Section S2.2).
