RESUMEN
Using the multidentate ligand bis(N-methylimidazol-2-yl)-3-methylthiopropanol (L), the mononuclear iron(II) hydroxo and iron(III) dihydroxo complexes [Fe(II)(L)2(OH)](BF4) (1) and [Fe(III)(L)2(OH)2](BF4) (2) have been synthesized and characterized by X-ray diffraction and spectroscopic methods. The X-ray data suggest that the remarkable stability of the Fe-OH bond(s) in both compounds results from intermolecular hydrogen-bonding interactions between the hydroxo ligand(s) and the tertiary hydroxyl of the L ligands, which prevent further intermolecular reactions.
Asunto(s)
Compuestos Férricos , Compuestos Ferrosos , Cristalografía por Rayos X , Compuestos Férricos/síntesis química , Compuestos Férricos/química , Compuestos Ferrosos/síntesis química , Compuestos Ferrosos/química , Enlace de Hidrógeno , Hidróxidos/química , Ligandos , Modelos Moleculares , Estructura MolecularRESUMEN
Model compounds for silica surfaces modified with metal complexes are provided by the mononuclear anionic diperoxo species 1 and the dinuclear complex anions 2 (M = Mo, W). They were obtained in fair to nearly quantitative yields by the reactions of Ph3 SiOH and [Ph2 Si(OH)]2 O, respectively, with an aqueous solution of [MO(O2 )2 (H2 O)2 ].
RESUMEN
The pH-dependent self-condensation of the [Mo2 S2 O2 ]2+ complex fragment gives the wheellike Mo12 cluster depicted on the right (ball-and-stick model; large balls: S, medium balls: O, small balls: Mo). Applying this synthetic strategy to other starting materials could provide access to other polyoxothiometalates with well-defined cavities.