Molecular Switchable Solids: towards photo-controlled magnetism

Molecular Switchable Materials are considered here in view of their potentialities towards the photo-control of magnetic properties. Major results obtained in the past few years are reviewed here, viz. generic features of photo-induced magnetism (external control of magnetic dilution, Raw Photo-Induced magnetic state), various photo-magnetic functionalities and recent successes in single-shot photo-excitation. The main challenges for the future clearly are : understanding the nature of the so-called Domino effect, reaching room-temperature photo-magnets.