Abstract
Schiff base ligand N,N′-bis(o-vanillinidene) ethylenediamine (o-VEDH2) has been employed to synthesize new [CoIICoIV(o-VED)(OAc)2(μ2-OAc)(OMe)]•MeOH (1) and [(o-VED)2(en)2(NCCH3)(OCH3)][La(NO3)6]()•2MeOH•MeCN•H2O (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 P21/c(14) and P21/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 H2O2 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 (Kb) of 1.22 × 105 M−1.
Highlights
In the last few years, multifunctional homo/pseudoheterometallic metal–organic frameworks (MOFs) showing distinct physical properties have been reported for the basic intensive research and for their potential applications in new technologies (Yang et al, 2015; Zhang et al, 2016; Clough et al, 2017; Dong et al, 2017; Long, 2019; Qi et al, 2019)
It was found that large ground state spin (S) and negative zero field splitting (D) are the two essential factors that determine single molecule magnets (SMMs) properties (Sessoli et al, 1993; Gatteschi and Sessoli, 2003; Tasiopoulos et al, 2004; Bogani and Wernsdorfer, 2010; Van Slageren, 2011; Vincent et al, 2012; Wu et al, 2019)
Elemental analysis and infrared spectroscopy indicated the formation of the pseudoheterometallic cluster (2)
Summary
In the last few years, multifunctional homo/pseudoheterometallic metal–organic frameworks (MOFs) showing distinct physical properties have been reported for the basic intensive research and for their potential applications in new technologies (Yang et al, 2015; Zhang et al, 2016; Clough et al, 2017; Dong et al, 2017; Long, 2019; Qi et al, 2019). It was found that large ground state spin (S) and negative zero field splitting (D) are the two essential factors that determine SMMs properties (Sessoli et al, 1993; Gatteschi and Sessoli, 2003; Tasiopoulos et al, 2004; Bogani and Wernsdorfer, 2010; Van Slageren, 2011; Vincent et al, 2012; Wu et al, 2019) In this regard, syntheses of lanthanide-based SMMs are quite of interest because of their various potential applications in high-density storage, quantum computers, and spintronics devices (Sessoli et al, 1993; Ishikawa et al, 2003; King et al, 2005; Tang and Zhang, 2015; Ding et al, 2016). In the past few years, researchers have reported cobalt and lanthanum complexes of Schiff base ligands and investigated their calf-thymus (CT)–DNA binding (Yang et al, 2006; Santini et al, 2013; Wang et al, 2014)
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