Synthesis, structures and magnetic properties of di- and tetranuclear manganese complexes derived from a 3-methoxysalicylaldehyde benzoylhydrazide ligand

An unusual two-dimensional 2-fold interpenetrating metal-organic framework based on tetranuclear manganese(II) clusters: Synthesis, structure and magnetic properties

“…The obtained J values are in agreement with qualitative magnetostructural correlations found in Mn(II) complexes [34]. J values reported in the literature with only carboxylate groups as bridging ligands are always small and negative, between approximately −0.2 and −5 cm − 1 [31,35,36], indicating a weak antiferromagnetic coupling.…”

A versatile salicyl hydrazonic ligand and its metal complexes as antiviral agents

“…3). In the literature there are some examples of dinuclear and multinuclear clusters of manganese with 2-hydroxy-3-methoxy-benzoylhydrazone [12] or 2-hydroxy-3-methoxy-benzylidene acetohydrazide [3] and, even when a mononuclear stoichiometry is isolated at the solid state, multinuclear systems are proposed in solution [11].…”

“…They are often used to build multinuclear metal complexes since they are versatile ligands and their coordination properties can be easily tuned from an electronic and a steric point of view [8][9][10]. Acylhydrazone ligands, in fact, can act as bidentate or tridentate chelating ligands and even as tetradentates, and can coordinate one or more metal centers [1,3,10,11]. Complexes of salicylaldehyde hydrazones with Mn(II), Cu(II), lanthanide(III), Pd(II), and Ni(II) have been previously studied [1][2][3][8][9][10][11] and they represent a challenging topic from the coordination point of view.…”

“…Acylhydrazone ligands, in fact, can act as bidentate or tridentate chelating ligands and even as tetradentates, and can coordinate one or more metal centers [1,3,10,11]. Complexes of salicylaldehyde hydrazones with Mn(II), Cu(II), lanthanide(III), Pd(II), and Ni(II) have been previously studied [1][2][3][8][9][10][11] and they represent a challenging topic from the coordination point of view. These ligands typically coordinate to the metal ion through the phenolic and carbonyl oxygens and the imine nitrogen atom.…”

Synthesis, structure, and magnetic properties of heterometallic {Zn2Ln2} (Ln=Tb, Dy, Ho) compounds with parallelogram-like cores

“…However, the Zn-Ln system has been infrequently studied [15] [18] and (ii) the o-vanillin group displays a variety of bonding geometries including monodentate, bidentate bridging, and chelate bridging [19].…”