Moessbauer spectroscopic studies of the HF interaction in [Fe(Hsub(2)O)sub(6-n)Fsub(n)]sup(3-n) complexes in frozen aqueous solution

The paramagnetic hf structure in Moessbauer spectra of [Fe(Hsub(2)O)sub(6-n)Fsub(n)]sup(3-n) complexes in magnetically dilute, frozen aqueous solutions has been used in a determination of the hf parameters and cf splittings of the complexes n=0, 1, 2, 3, 4. The cf splitting Δsub(n) is found to increase slightly from n=0 to n=1, but to decrease for n>1 until Δsub(n)/Δ0=0.5 for n=4. The saturation hf field increases by about 3kG per fluorine ligand