engleski

Heterometallic Ferrocene-Rhenium Complexes Linked by an Aminoethylglycine Scaffold

Using mono- and 1, n-disubstituted ferrocenecarboxylic acid, the aminoethylglycine (aeg) derivatives Fe[C5H4-CO-aeg-OtBu][C5H5] (1) and Fe[C5H4-CO-aeg-OtBu]2 (2) have been synthesized. Complexes 1 and 2 are further reacted to substitute the aeg with the nitrogen-containing ligands dpa-ph-CO2H or py-AcOH to yield complexes 3– 6. Each of these is treated with Re(CO)5Cl to assemble heterometallic structures 3Re– 6Re. These are subsequently isolated and characterized by NMR and mass spectrometry, FTIR, UV/Vis absorbance, and fluorescence emission spectroscopy, and separately by electrochemistry. All of the compounds exhibit the characteristic redox properties of the ferrocene moiety ; in the heterometallic compounds, an irreversible oxidative wave is attributed to the Re. The electrochemically determined diffusion coefficients of the compounds confirm that the as-prepared structures are discrete assemblies and not coordination polymers.

Sandwich complexes ; Ferrocene ; Rhenium ; Heterometallic complexes ; Peptides

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