Abstract
“Ligand-driven light-induced spin change” (LD-LISC) is a photomagnetic effect based on the modulation of the ligand-field strength of a suitable spin-crossover complex through a photochemical reaction on the ligand. It allows one to switch the electronic spin state of the metal ion by means of light over a broad range of temperatures possibly including room temperature. Among the photochemical reactions capable of triggering the spin conversion reversibly, we have firstly selected cis-trans isomerization. The occurrence of the LD-LISC effect was shown in several iron(II) or iron(III) complexes. On varying the molecular components, the working temperature and excitation wavelengths were modulated so that the effect could be observed at room temperature upon irradiation of the sample with visible light. The experiments were performed on compounds either in solution or included in polymeric matrices.
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