The static magnetic properties of 1 -3 were examined on polycrystalline samples in the temperature range of 1.85 -300 K at 1000 and 10000 Oe (Figure and Figures ). The measured T ( is magnetic susceptibility equal to M/H per Dy(III) ion) value for complex 1 is 13.75 cm 3 mol -1 K at 280 K and for complexes 2 and 3 are 14.10 and 14.22 cm 3 mol -1 K respectively at 300 K (Figure ), which are in good agreement with the expected value for one Dy(III) (S = 5/2, L = 5, 6 H15/2, g = 4/3, T = 14.17 cm 3 mol -1 K) ion. The T values do not change significantly down to 100 K for all three complexes. Upon further lowering of the temperature, the T value shows a slow decrease to attain the lowest value of 8.24 cm 3 mol -1 K at 1.9 K for complex 1, 10.93 cm 3 mol -1 K at 2.50 K for complex 2, and 10.92 cm 3 mol -1 K at 1.85 K for complex 3, while a sudden increase in T value to 13.57 cm 3 mol -1 K between 2.5 K -1.85 K was observed for complex 2. The T vs. T measurements under a higher magnetic field of 10000 The relaxation time of the magnetization  was deduced as a function of the temperature at 0 Oe for complexes 1 -3 and as a function of the applied dc-field at 8 K for complex 3 from the experimental ′ vs. ν and ′′ vs. ν data fitted to the generalized Debye model (Figures and).