-units and [Fe(salten)Mepepy] cations. In the Ni compound photo-isomerisation of the Mepepy ligand can be observed in dichloromethane solution. The temperature dependence of the magnetic susceptibility of the compounds reveals a gradual S = 5/2 h S = 1/2 spin crossover of the Fe III ions. This phenomenon is confirmed by Mössbauer spectroscopy for the Ni compound, which also reveals a mag-
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