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Journal Articles Journal of Physical Chemistry Letters Year : 2019

Direct Observation of Charge Transfer and Magnetism in Fe4 Co4 Cyanide-Bridged Molecular Cubes

Abstract

We have studied the zero-dimensional cubane molecular correspondent of a Prussian blue analogue Cs–Fe4Co4 at low temperature and high magnetic field by means of L-edge X-ray absorption spectroscopy and X-ray magnetic circular dichroism. We probe the magnetic and electronic structures of Fe and Co separately upon light irradiation, which allows us to observe directly the electron transfer coupled to a spin transition phenomenon within the molecular cubes and to investigate the nature of the metastable photoexcited state. The magnetic moments in the photoexcited state are found to be M = 1.3μB (Mspin = 0.59μB with large orbital moment, Morbit = 0.74μB) for low-spin FeIII and M = 1.5μB (Mspin = 1.08μB with orbital moment, Morbit = 0.41μB) for high-spin CoII at 2 K and 6.8 T. From our results, we evidence that a strong antiferromagnetic coupling between the metal ions can be ruled out.
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Dates and versions

hal-02297931 , version 1 (26-09-2019)

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Niéli Daffé, Marie-Anne Arrio, Juan-Ramón Jiménez, Michał Studniarek, Amina Benchohra, et al.. Direct Observation of Charge Transfer and Magnetism in Fe4 Co4 Cyanide-Bridged Molecular Cubes. Journal of Physical Chemistry Letters, 2019, 10 (8), pp.1799-1804. ⟨10.1021/acs.jpclett.8b03839⟩. ⟨hal-02297931⟩
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