Temperature dependent magnetic susceptibility measurements on complexes 13 and 14 revealed the occurrence of SCO behavior in both complexes (Fig. ). At 400 K, the observed T value 3.51 cm 3 mol -1 K for complex 13, is typical for mononuclear Fe(II) HS complex. Upon decreasing temperature, the T value decreases sharply first, then slowly decreases below 300 K, finally reaching a T value of 0.04 cm 3 mol -1 K, showing the characteristic of Fe(II) LS ion. For complex 14 also, T vs. T plot revealed similar SCO behavior while going from 2 K to 300 K. At 300 K, the T value of 3.66 cm 3 mol -1 K corresponding to Fe(II) HS state decreases sharply upon initial cooling, then decreasing slowly below 150 K, finally reaching a minimum value of 0.14 cm 3 mol - 1 K at 2 K. The influence of solvent molecules on the spin state was also investigated, and it was observed that the desolvated sample 14-d didn't show any SCO behavior and remained in the HS state over the temperature range of 2-300 K.