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. Author manuscript; available in PMC: 2014 Jan 15.
Published in final edited form as: Coord Chem Rev. 2012 Jun 6;257(2):511–527. doi: 10.1016/j.ccr.2012.05.008

Figure 3.

Figure 3

Structural diagrams for (a) FeTPP-Y, and (b) FeP-X porphyrins used, respectively, in experimental determination and computational modeling of backbonding trends. Y and X are the indicated substituents, listed in order of electron-donating to -withdrawing propensity (–X4 indicates that –X and –H substituents alternated around the ring). For 6-coordinate adducts, the experiments included 4-methyl imidazole (a histidine mimic), and the computations included imidazole as axial ligands.