In the domain of transition metal complexes, there are several possibilities for generating light-induced switches accompanied by drastic modifications of magnetic, volume and/or optical properties.1-4 Among the best known and extensively studied systems, we can cite metal-centered thermal spin-transition (observed in iron(II) SCO materials), valence tautomerism (catecholate complexes of Co(II)), metal-to-metal charge transfer (Prussian Blue analogs), metal-to-ligand charge transfer (nitroprusside complexes), and finally, ail ligand modifications that induce a change of spin state, such as isomerization (stilbenoid complexes) and open/close (diarylethene type ligands) processes...