To explore the synergic relation between SCO and luminescence in 26, PL measurements were carried out at room temperature as well as between 270 to 70 K (Fig. , blue curve). At room temperature, the 26 exhibited two emission bands centered at 1 = 524 nm, 2 = 570 nm while excited at 395 nm, which were significantly different from the emission band of 565 nm of the free L20 ligand, indicating the effect of coordination of the metal center with ligand. Upon lowering the temperature, the emission intensity of 1 = 524 nm (I524) decreased to reach a minimum at around 150 K and then rose gradually till 70 K (Fig. ). The minimization of I524 around SCO temperature (150 K) confirmed the unified correlation between luminescence and SCO.