Synthetic molecular machines have opened up avenues for dynamically controlling the functions of molecular materials. These controls are achieved by carefully programming the molecular system with suitable switchable moieties connected to functional units that can activate and deactivate specific functions on demand. Remarkable control of various molecular functions, such as light-powered molecular motors, has become possible. The quest to stabilize free radicals has been a focal point of scientific exploration for decades, driven by their crucial roles in various domains, including molecular magnetism , organic spintronics , organic semiconductors and memory devices. Diverse molecular architectures have been developed to achieve radical stabilization by incorporating multiple electron sinks, or poly aromatic hydrocarbons (PAHs) among others. However, conventional methods for generating radical anions or cations often require the use of extensive oxidizing or reducing agents, some of which may be environmentally hazardous. However, non-chemical stimuli such as light or heat can control the spin of a molecule dynamically that may provide switchable materials for applications in memory and switches. The ability to have ondemand control over the formation and destruction of radicals is intriguing. Successful switching of spin states in all-organic molecules is a rare achievement. Abe's research group has crafted a single-molecule photochromic switch. This switch comprises hexaarylbisimidazole units capable of undergoing rapid and reversible biradical formation, with a half-life measured in milliseconds even at room temperature. Juríček's group have introduced an innovative photoswitchable dimethylcethrene, offering the potential to generate a diradical triplet state upon irradiation of the closed diamagnetic form. In their approach, a photochemical 6π retroelectrocyclization process leads to the open helical configuration containing a para-quinodimethane motif, displaying a diradicaloid singlet structure. Dumele's group have recently showcased an innovative organic molecular spin-state switch capable of undergoing a photochemical transformation from a diamagnetic to a paramagnetic state at extremely low temperatures. Chen et al. have also explored the use of a photochromic unit to stabilize a radical. They combined dithienylethene photochromic units with pyrrole to detect a stable radical species under UV-light and oxygen exposure in a chloroform solvent. The planar closed isomer promotes spin delocalization throughout the molecular backbone.