Synthesis and Structure of Iron(III) Complex with N,N,O-Donor Aroylhydrazones: The Chloride Anion as Hydrogen Bond Acceptor Forming Infinite Chains

Abstract

A new iron(III) complex, [FeL₂](Cl)·(CH₃OH)_0.5 with acyclic tridentate 5-bromo-salicylaldehyde-6-chloro-2-pyridyl hydrazone (HL) has been synthesized and structurally characterized. The crystal structure consists of chains of alternating [FeL²]⁺ cations and Cl^– anions, linked together by N–H···Cl–···H–N hydrogen bonds. Two tridentate monoanionic meridionally spanning ligands form a distorted octahedral N₄O₂ coordination sphere around the metal ion.