Figure 6.

Mössbauer spectra of the products of the reaction of Mn^IV/Fe^III–β₂ with (1) hydroxyurea, (2) hydroxylamine, (3) N,N-dimethyl-hydroxylamine, (4) acetohydroxamic acid, and (5) hydrazine. Spectra were collected at 4.2 K without applied field (A) and in an external magnetic field of 53 mT orientated parallel to the γ-beam (B). The arrows indicate the position of the quadrupole doublet of the Fe^III-containing diamagnetic species. The reaction of Mn^IV/Fe^III–β₂ with hydrazine does not result in generation of the Fe^III-containing diamagnetic species. To illustrate this, the spectra of the Mn^IV/Fe^III form (with 90% of the total intensity) are overlaid for clarity as solid red lines. Instead, a small amount of a high-spin Fe^II species (~10%), which is evident from the weak absorption feature at ~3 mm/s, is formed in the reaction with hydrazine.