The iron(III) complex [(PNP)FeCl2] exhibits slow relaxation of the magnetization in zero applied field. This is evidenced by the out-of-phase ac susceptibility data and the Arrhenius plot  presented in the figure. The frequencies range from 10 to 1000 Hz.The slow relaxation phenomenon observed at low temperature and the gradual spin transition observed at temperatures above 80 K have been investigated by Squid magnetometry, X-ray diffraction, M�ssbauer and EPR spectroscopy. 

Mononuclear Fe(III) single molecule magnet with a 3/2 to 5/2 spin crossover

243rd National Meeting (2012)

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