Figure S1 The structure of 1 with 30% probability ellipsoid (a) and molecular fill map (b). Hydrogen atoms are omitted for clarity.

Figure S2 FT-IR spectrum of (a) 1 and (b) 2.

Figure S3 The superposed simulated and observed spectra of several species for 1 (In-Source CID 0 eV).

Figure S4 The superposed simulated and observed spectra of several species for 2 (In-Source CID 0 eV).

Figure S5 M versus H plots under different temperatures for (a) 1 and (b) 2.

Figure S6 Plots of Magnetic hysteresis loops for (a) 1 and (b) 2.

Figure S7 χ’-v and χ“-v plots under different dc fields for 1.

Figure S8 χ’-v and χ“-v plots under different dc fields for 2.

Figure S9 (a) χ’-T and (b) χ”-T plots for 1 with Hdc = 2000 Oe and Hac = 3 Oe.

Figure S10 (a) χ’-T and (b) χ”-T plots for 2 with Hdc = 1,000 Oe and Hac = 3 Oe.

Figure S11 χ′-v plots for (a) 1 and (b) 2 with Hdc = 1,000 Oe and Hac = 3 Oe.

Table S1 Crystallographic data and structure refinement parameters for complexes 1 and 2.

Table S2. SHAPE analysis of Dy (III) in 1 and Tb (III) in 2.

Table S3 Selected bond lengths /Å and bond angles / ° for 1.

Table S4 Selected bond lengths/Å and bond angles/ ° for 2.