Assessing the impact of inductive electronic effects on the metrical parameters and reactivity of a series of ferrous complexes

Abstract

Reported are four iron(II) complexes with N-benzyl- N, N′-bis(2-pyridylmethyl)-1,2-ethanediamine (L H) and three electronically modified derivatives: N-(4-methoxy)benzyl- N, N′-bis(2-pyridylmethyl)-1,2-ethanediamine (L OMe), N-(4-chloro)benzyl- N, N′-bis(2-pyridylmethyl)-1,2-ethanediamine (L Cl), and N-(4-nitro)benzyl- N, N′-bis(2-pyridylmethyl)-1,2-ethanediamine ( L NO 2 ). The four ligands react with FeCl 2 to form a series of mononuclear species with the general formula [Fe(L R)Cl 2]. The cis-α conformation of the ligand places the amine N-donors trans to the Fe–Cl bonds. The identity of the 4-benzyl substituent has profound influences on the lengths of the iron-ligand bonds, the optical spectra, and the redox activities of the [Fe(L R)Cl 2] compounds.