Figure 155.

Comparisons of (A) O−O, (B) M−O, and (C) M···M distances found in “oxidized” (also referred to as “as-isolated” or “resting-state”) CcO crystals reported to contain a bridging peroxide moiety in the BNC. The red dots represent the particular protein Xray structures shown in Figure 154 and listed in Table 6. Bonding parameters reported for putative peroxo bridged heme-Cu BNC protein X-ray structures, some reported at quite high resolution, are outside the range established for peroxo-bridged small molecules. An exception appears to be protein structure entry 50, PDB: 3HB3. See the text for further discussion.