The reaction of [FeII(L.)2](BF4)2 with Li2TCNQF4 results in the formation of [FeIII(L-)2][TCNQF4 . -](1) where L. is the radical ligand, 4,4-dimethyl-2,2-di(2-pyridyl)oxazolidine-N-oxide and TCNQF4 is 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane. This has been characterised by X-ray diffraction, Raman and Fourier transform infrared (FTIR) spectroscopy, variable-temperature magnetic susceptibility, Mössbauer spectroscopy and electrochemistry. X-ray diffraction studies, magnetic susceptibility measurements and Raman and FTIR spectroscopy suggest the presence of low-spin FeIII ions, the anionic form (L-) of the ligand and the anionic radical form of TCNQF4; viz. TCNQF4 . -. Li2TCNQF4 reduces the [FeII(L.)2]2+ dication, which undergoes a reductively induced oxidation to form the [FeIII(L-)2]+ monocation resulting in the formation of [FeIII(L-)2][TCNQF4 . -](1), the electrochemistry of which revealed four well-separated, diffusion-controlled, one-electron, reversible processes. Mössbauer spectroscopy and electrochemical measurements suggest the presence of a minor second species, likely to be [FeII(L.)2][TCNQF4 2-].
- Charge transfer
- Magnetic properties