To investigate the synergic interconnection between luminescence and SCO, PL measurements were carried out for the 24 at 300 -400 K, excited with 337 nm nitrogen laser. The dinuclear complex exhibited two emission peaks centered at 2 = 686 nm, and 1 = 550 nm, which remained unchanged upon changing temperature. The PL spectra of the 24 also revealed two emission peaks centered at 2 = 673 nm and 1 = 550 nm (Fig. ). Significant changes in the intensity of both emission peaks were observed in spin transition area upon changing temperature, where a prominent effect was noticed for the 1 = 550 nm. The temperature rise of the emission intensity ratio of peaks 1 and 2 as PL(2)/PL(1) showed the occurrence of SCO following a similar curve shape as the temperature dependence of T (Fig. ). Upon increasing temperature PL(2)/PL(1) stays constant up to 365 K, then starts increasing sharply to attain a constant value at around 400 K. With lowering temperature, the high-temperature value was constant down to 33 K, then reduced gradually to reach the initial value at 300 K. The overall results demonstrated a magnificent interplay among the luminescence and SCO properties in 24.