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Synthesis, crystal structure, magnetism, and biological activities of an oxo-bridged diiron(III) complex

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An unsymmetrical oxo-bridged diiron(III) complex [Fe2 L 2(μ-O)], {H2 L = trans-N,N′-bis-(2hydroxy-1-naphthalidehydene)-cyclohexanediamine} has been synthesized and characterized by various physico-chemical techniques. In the complex, each deprotonated bi-anionic L 2− serves as a terminal tetradentate ligand (N2O2) and coordinates to one Fe to form a [FeL]+ unit. Two [FeL]+ units are further linked by an oxo-bridge to construct the binuclear oxo-Fe species with intramolecular Fe–Fe separation of 3.38 Å. Variable-temperature magnetic susceptibility studies revealed a strong antiferromagnetic interaction between two iron centers with J of −112 cm−1. The interaction of the complex with CT-DNA was studied by various spectroscopic and viscosity measurements, which indicated that the complex could interact with CT-DNA through intercalation. In addition, the complex is able to cleave pBR322 DNA in the presence of H2O2. Furthermore, the interaction of the compound with BSA was also investigated, which indicated that the complex could quench the intrinsic fluorescence of BSA by a static quenching mechanism.
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Keywords: DNA binding; Magnetic property; Oxo-bridged binuclear iron; Schiff base ligand

Document Type: Research Article

Affiliations: Department of Chemistry, Nankai University, Tianjin, PR China

Publication date: June 18, 2014

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