Later in 2020, our group reported a unique 2D CP, {[Fe(L20)2(NCSe The magnetic properties of 26 were explored by measuring T vs. T on polycrystalline samples of 26 at a magnetic field of 1000 Oe in between 280 K and 2 K (Fig. , red curve). The 26 exhibited a gradual LS to HS SCO at T1/2 = 150 K, where the T values were 3.25 and 0.15 cm 3 mol -1 K at 280 and below 55 K, respectively. The SCO property was also supported by the thermally dependent absolute reflectivity measurements. Interestingly, 26 showed ON/OFF and an almost complete photo-switching between LS ground state and photo-induced HS state using consecutive 625 nm and 850 nm light irradiation over many cycles at around 10 K under an external dc magnetic field of 10000 Oe, which was studied by absolute optical reflectivity and photomagnetic studies . This photo-induced metastable HS state relaxes back to LS ground state at 80 K (showing TLIESST = 80 K) while kept heating 26 in the dark .