Single Molecule Magnets of Co and CoLa MOFs Synthesized by New Schiff Base Ligand N,N'-bis(-Vanillinidene) Ethylenediamine (-VEDH).

Schiff base ligand N,N'-bis(-vanillinidene) ethylenediamine (-VEDH) has been employed to synthesize new [CoCo(-VED)(OAc)(μ-OAc)(OMe)]•MeOH () and [ (-VED)(en)(NCCH)(OCH)]La(NO)•2MeOH•MeCN•HO () metal-organic frameworks (MOFs) that have interesting single molecule magnets (SMMs) property. The synthesized complexes are characterized by single crystal X-ray diffraction, fourier transform infrared spectroscopy (FTIR), UV-visible spectroscopy, and squid magnetic measurement. Single crystal X-ray data show that both complexes crystallize in the monoclinic crystal system with 2/(14) and 2/(14) space groups and generate unique MOF-like structures. Overall, both the metal centers of form octahedral geometry with a butterfly core structure. Variable temperature () and field () solid-state direct-current (dc) and alternative current (ac) magnetic susceptibility measurements were performed on both the complexes over 1.8 to 300 K, which exhibited a ground state spins (S) of 4 and 5 of complexes and , respectively. The AC out-phase and in-phase properties of complexes show SMMs. Other properties such as optical, sensing, and DNA-binding interactions were also investigated by the complexes. Complexes and have energy band gaps of 3.7 and 3.03 eV indicating semiconductor properties. Simultaneously, complex was found to sense HO with a rate constant () = 1.59 × 10 s, whereas complex was found to bind with calf-thymus-DNA by intercalation mode with binding constant ( ) of 1.22 × 10 M.