Substituent effect on the oxidation and reduction of electronically altered iron(II)-terpyridine derivatives – DFT study

Fe(ii) complexes of 2,2′:6′,2′′-terpyridine ligands functionalized with substituted-phenyl groups: synthesis, crystal structures and anticancer potential

“…In terms of configuration, the coordination of Fe( ii ) with this terpyridine ligand forms andwich-like structures, consistent with most other reported Fe( ii )-terpyridine complexes. 32 The average bond length between Fe( ii ) and six N atoms in complex 1 is 1.933 Å, where the distance from Fe( ii ) to the N atom on the middle pyridine ring is shorter than that on both sides. The coordination pattern of the remaining complex crystals is similar to that of complex 1 , and the average bond lengths of Fe( ii ) to six N atoms range from 1.940 to 1.943 Å.…”