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A series of diiron/tetrairon compounds containing a S- or a Se-function ( 2a – d ,  4a – d ,  5a – b ,  6 ), and the monoiron [FeCp(CO){SeC 1 (NMe 2 )C 2 HC 3 (Me)}] ( 3 ) were prepared from the diiron μ-vinyliminium precursors [Fe 2 Cp 2 (CO)( μ-CO){μ-η 1 : η 3 -C 3 (R’)C 2 HC 1 N(Me)(R)}]CF 3 SO 3  (R = R’ = Me,  1a ; R = 2,6-C 6 H 3 Me 2  = Xyl, R’ = Ph,  1b ; R = Xyl, R’ = CH 2 OH,  1c ), via treatment with S 8  or gray selenium. The new compounds were characterized by elemental analysis, IR and multinuclear NMR spectroscopy, and structural aspects were further elucidated by DFT calculations. The unprecedented metallacyclic structure of  3  was ascertained by single crystal X-ray diffraction. The air-stable compounds ( 3 ,  4a – d ,  5a – b ,  6 ) display fair to good stability in aqueous media, and thus were assessed for their cytotoxic activity towards A2780, A2780cisR, and HEK-293 cell lines. Cyclic voltammetry, ROS production and NADH oxidation studies were carried out on selected compounds to give insights into their mode of action.

molecules/molecules online/molecules annual

Mono-, Di- and Tetra-iron Complexes with Selenium or Sulphur Functionalized Vinyliminium Ligands: Synthesis, Structural Characterization and Antiproliferative Activity