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Structures of TAMLs: (A) H4B* (R = −CH3, X = −H); H4DCB (R = −CH2CH3, X = −Cl); H4DMOB (R = −CH2CH3, X = −OCH3) and (B) H4MAC*. Iron complexes with various axial ligands: (C) [FeIII(H2O)B*]− (1), (D) [FeIV(O)(NCMe)TMC]2+, and (E) [FeIV(O)TMCS]2+.