A new μ3-oxo-centered tri-nuclear carboxyl bridged iron (III) complex with thio-methyl groups in the periphery: Structural, spectroscopic and electrochemical studies

• A tri-nuclear iron (III) complex with thio-methyl groups in the periphery has been synthesized.
• Molecular structure has been established by X-ray crystallography.
• IR study confirms the formed of bridging carboxylates.
• AgS bond has been characterized by Raman and UV–Vis spectra.
• Cyclic volammograms represent an irreversible redox wave.

A tri-nuclear iron (III) complex [Fe3(μ3-O)(O2CC6H4SCH3)6(Py)3]FeCl4 has been synthesized and characterized by X-ray crystallography, Surface enhanced Raman Scattering (SERS), Fourier Transform Infra Red (FT-IR), Ultraviolet–Visible (UV–Vis) spectroscopy and Thermogravimetric analysis (TGA)/Differential scanning calorimetry (DSC). The functionalized thio-methyl groups around the periphery of the complex 1 may provide binding sites to the surface of some specific materials, such as noble metals. The Ag sols and complex 1-Ag sol had been characterized by SERS and UV–Vis spectroscopy. The complex 1 were also self-assembled on gold electrode by AuS bond, exhibiting an irreversible process at E1/2 = 0.967 V (ΔE = 0.525 V). Meanwhile the Raman spectra were compared with FT-IR, and the results indicated that the strong Raman lines either correspond to weak Infrared absorptions or are absent in the Infrared spectra.

A new tri-nuclear Fe(III) complex with surface binding sites was successfully prepared and self-assembled to the surface of silver.Figure optionsDownload as PowerPoint slide