Spectroscopic and magnetic studies of a mixed-valence iron fluoride, Fe2F5.cntdot.7H2O

A Mixed-Valence Fluorido-Bridged FeIIFeIII Complex

“…Mixed-valence complexes have been extensively investigated in the last decades for the fundamental study of electron transfer and electronic structure in general. − Mixed-valence compounds of iron, in particular, have attracted interest because of their presence in the active site of metalloproteins and their interesting properties like double exchange. , The coordination chemistry of complexes with Fe–F bonds is less well explored than that with other donor atoms, but complexes with Fe–F bonds have recently received increased attention in the field of magnetic materials − and catalysis . Three-dimensional (3D) network structures of mixed-valence iron fluorides have been explored − and are of relevance for cathode materials for rechargeable lithium batteries. − …”

Fenton Activity and Cytotoxicity Studies of Iron-Loaded Carbon Particles

“…The Raman spectrum of Fe 2 F 5 is shown in Figure 5 of Supporting Information. X-ray diffraction, Mossbauer spectroscopy, and magnetic properties of Fe 2 F 5 suggest the formula [Fe 2+ ] [FeF 5 (H 2 O)] 2− . The bands at 493 and 410 cm −1 are assigned to the Fe−F stretching vibrations in the [FeF 5 (H 2 O)] 2− molecule (C 4v geometry) based on the Raman spectrum of FeF 6 3− .…”

“…Carbon can also be gasified, reducing iron oxides to zerovalent iron. During etching with hydrofluoric acid, the following reactions can occur ,, : Fe 0 + 2 H 3 O + → Fe 2 + + 2 H 2 + 2 − OH; .25em Fe 2 + ≡ false[ Fe false( H 2 O false) 6 false] 2 + 4 Fe 2 + + O 2 + 4H + → 4Fe 3 + + 2H 2 O Fe 2 + + 2F − ↔ FeF 2 …”

“…However, since Fe 2 F 5 is a likely candidate formed during the etching, we synthesized this compound. Upon dissolution of Fe 2 F 5 , it is known that the cationic species is Fe 2+ and the anionic species is [FeF 5 (H 2 O)] 2- (13). The Fenton activity of Fe 2 F 5 observed in Figure 5 stems from the presence of Fe 2+ .…”