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Schiff base ligand N,N′-bis( o -vanillinidene) ethylenediamine ( o -VEDH 2 ) has been employed to synthesize new [Co II Co IV ( o -VED)(OAc) 2 (μ 2 -OAc)(OMe)]•MeOH ( 1 ) and [Co    2    IV( o -VED) 2 (en) 2 (NCCH 3 )(OCH 3 )][La(NO 3 ) 6 ](NO   3   −    )•2MeOH•MeCN•H 2 O ( 2 ) 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  P 2 1 / c (14) and  P 2 1 / n (14) space groups and generate unique MOF-like structures. Overall, both the metal centers of  1  form octahedral geometry with a butterfly core structure. Variable temperature ( T ) and field ( H ) 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  1  and  2 , 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  1  and  2  have energy band gaps of 3.7 and 3.03 eV indicating semiconductor properties. Simultaneously, complex  1  was found to sense H 2 O 2  with a rate constant ( k ) = 1.59 × 10 −4  s −1 , whereas complex  2  was found to bind with calf-thymus–DNA by intercalation mode with binding constant ( K   b  ) of 1.22 × 10 5  M −1 .

Single Molecule Magnets of Co2 and Co2La MOFs Synthesized by New Schiff Base Ligand N,N′-bis(o-Vanillinidene) Ethylenediamine (o-VEDH2)