| Abstract
| - Needs for ferrocene immobilization on robust host structures are considerable since derivativematerials may find applications in medical areas, optical devices, or catalysis. Synthesis of phosphonatefunctionalized ferrocene allowed its subsequent inorganic polymerization with a zinc salt. The crystallographicstructure of the compound obtained, Zn(HO3PFc)2·2H2O, shows a unique two-dimensional ferrocenearrangement anchored on a one-dimensional Zn−O−P−O−Zn backbone. The ferrocene packing in thetitle compound is very similar to the packing found in molecular ferrocene. The electroactivity of Zn(HO3PFc)2·2H2O is thoroughly studied. It shows a reversible surface oxidation of ferrocene. Mössbauerspectroscopy for the oxidized compound shows an isomer shift of IS2b = 0.432 mm.s-1 and a quadrupolarsplitting of QS2b = 0.205 mm.s-1, which is consistent with a stable S = 1/2 ferrocenium state. The magneticsusceptibility study, Mössbauer spectroscopy, and galvanostatic titration show that only the ferrocenemoieties present at the surface of the crystallites are reversibly oxidized. This observation is reinforced bya complex impedance study showing mainly resistive behavior and conductivity measurements indicatingweak, thermally assisted, conductivity. The general properties of this compound demonstrate thatphosphonato functionalization may be a useful approach for all fields concerned by immobilization offerrocene.
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