Abstract
We have investigated the physical properties of ( n-C 3H 7) 4N[Fe IIFe III(dto) 3] (dto=C 2O 2 S 2) by means of 57Fe Mössbauer spectroscopy and magnetic susceptibility measurement. From the analysis of 57Fe Mössbauer spectra and magnetic susceptibility, we have discovered a new type of first order phase transition around 120 K, where the charge transfer transition between Fe II and Fe III occurs reversibly. In the higher temperature phase, the Fe III ( S=1/2) and Fe II ( S=2) sites are coordinated by six S atoms and six O atoms, respectively. In the lower temperature phase, on the other hand, the Fe III ( S=5/2) and Fe II ( S=0) sites are coordinated by six O atoms and six S atoms, respectively. Moreover, we have found the ferromagnetic phase transition at 6.5 K. The ferromagnetic order is presumably induced by the charge transfer interaction between the Fe III ( S=5/2) and Fe II ( S=0) sites.
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