Again, when the sample is irradiated with 808 nm light, the dielectric constant increases from .02 to 16.58 within 5 minutes and then stays constant upon further irradiation (Fig. ). This switching in the dielectric property upon irradiation of various light is reversible and doesn't change with applying different power of lights . ) and also exhibits strong cooperativity as it exhibits thermal hysteresis in the magnetic profile. Complexes 68 and 69 reveal a 19 K (Fig. ) and 20 K wide thermal hysteresis loop, respectively. Both the complexes showed the LIESST effect when irradiated with 505 nm light and showed the reverse LIESST effect when irradiated with 808 nm light at 10 K. The dielectric measurement also revealed a hysteretic transition having a 20 K wide hysteresis (Fig. ) . The hysteretic behavior of both magnetic and dielectric properties shows that there is synergy between these two properties. Adapted with permission from Ref. .