Fig. 7. (a) Bis(histidine) complexation to metal ions. (b) Antiparallel C2-symmetric dimers of the type 2Cu2+:2 cytochrome cb562 or C3-symmetric trimers of the type 2Ni2+:3 cytochrome cb562 formed due to influence of the respective metal ions on the coordination geometry. Adapted with permission from ref. 124. Copyright 2009 American Chemical Society. Protein images (PDB: ; 3DE8, ; 3DE9) were adapted from the NGL viewer.240 (c) Complexation of PB modified with 1,10-phenanthroline to Ni2+ ion. (d) Light driven coordination of Mg2+ with spiropyran/merocyanine ligands.
