Crystal Structure and Corrosion Inhibition Properties of Ferrocenyl- and Phenylendiamine-Iminomethylphenoxy Cobalt Complexes

Abstract

The crystal structures of bis[2-(ferrocenyliminomethyl) phenoxy]cobalt(II) (CoII(L)2) [monoclinic, a = 12.5466(3) Å, b = 10.6782(3) Å, c = 21.2695(6) Å, α = γ = 90°, β = 92.944(2)°, V = 2845.82(13) Å3, Z = 4, space group P21/ c] and bis(2-[(4-dimethylamino- phenylimino)-methyl]-phenoxy) cobalt (II) (CoII(M)2) [triclinic, a = 10.2916(4) Å, b = 16.4867(10) Å, c = 17.6782(11) Å, α = 114.754(2)°, β = 96.614(4)°, γ = 97.736(4), Z = 4, space group P-1] dominated by extensive hydrogen bonding such as O–H···N, N–H···O and N–H···N interactions. In both structures the central CoII is displaying a slightly distorted tetrahedral coordination sphere involving two iminoethyl-phenoxy ligands. The inhibition efficiency of the Co complexes concerning the corrosion of mild steel in acidic solution has been investigated by electrochemical impedance spectroscopyThe crystal structures of two bis(iminomethylphenoxy) cobalt complexes containingrespectively a ferrocenyl and a phenylendiamine group are described. First results on their inhibition properties concerning the corrosion of mild