Study on the ferromagnetic state in iron mixed-valence complexes, A[FeIIFeIII(dto)3] (A = (n-CnH2n + 1)4N; dto = C2S2O2) by means of Mössbauer spectroscopy

Abstract

We have investigated the ferromagnetic states for (n-C n H 2n+1 ) 4 N[Fe II Fe III (dto) 3 ] (n = 3-6; dto = C 2 O 2 S 2 ) by means of 57 Fe Mössbauer spectroscopy. The major component of the spin configuration in the ferromagnetic states for n = 3 and 4 is the low-temperature phase (LTP) with the Fe III (S = 5/2) and Fe II (S = 0) states. The high-temperature phase (HTP) of n = 4 remains by more than 20%, which is consistent with two ferromagnetic transitions (T C = 7 & 13 K). Moreover, it was revealed that the Mössbauer spectra in the ferromagnetic states for n = 5 and 6 correspond to the HTP consisting of the Fe II (S = 2) and Fe III (S = 1/2) states.