Tuning structural topology of zinc(II)-benzoate coordination complexes with 1,2-bis(4-pyridyl)ethene by controlling metal-to-ligand ratios and solvent systems: Their photoluminescence and catalytic activities

Metal-directed assembly of metal(II) benzoates (M = Mn, Ni, Co, Cu, Zn, and Cd) with 1,2-bis(4-pyridyl)ethene: Light- and photo-induced [2 + 2] cycloaddition

“…The bridging bpe ligands are aligned parallel with about 3.8 Å distances between double bonds. The previously reported 5-Zn [21] is also a 1-D ladder-type polymer similar to the structure of 1-Mn. In a dinuclear unit, two benzoate ligands bridge two Zn(O 2 CPh) + ions, and there is an inversion center on the middle of the dinuclear unit (see Scheme 1).…”

“…We report here the syntheses, structures, thermal stabilities, and photoluminescence of four novel M II coordination polymers (1-Mn, 3-Ni, 4-Cu, and 6-Cd), and comparison of coordination geometries of metal ions including the previously known compounds 2-Co [12] and 5-Zn [21]. Moreover, light and photo-induced [2 + 2] cycloaddition is discussed.…”

“…Moreover, the influence of the metal ion effects was also investigated from the reaction of various metal-benzoates with a rigid ligand 4,4′-bipyridine (4,4′-bpy) [18] and a bridging flexible ligand 1,2-bis(4-pyridyl)ethane (bpa) [19]. Importantly, the assembly process of metal-benzoates and bipyridyl ligands has been highly influenced by solvent system [17], pH [20], metal-to-ligand ratio [17], and the coordination geometry of metal ions [19].We report here the syntheses, structures, thermal stabilities, and photoluminescence of four novel M II coordination polymers (1-Mn, 3-Ni, 4-Cu, and 6-Cd), and comparison of coordination geometries of metal ions including the previously known compounds 2-Co [12] and 5-Zn [21]. Moreover, light and photo-induced [2 + 2] cycloaddition is discussed.…”

“…3). Such emissions of complexes 3 and 4 can be tentatively assigned to the metal-to-ligand charge transfer (MLCT) and/or ligandto-metal charge transfer (LMCT), because they are red-or blue-shifted compared to the corresponding bpe ligand and ammonium benzoate has no fluorescence [21]. In addition, they might be a good candidate for a potential hybrid inorganic-organic photoactive material, because they showed the intense emissions at room temperature [29].…”

Synthesis and Crystal Structure of a Mn(II) Metal-Organic Framework Based on a Polydentate Schiff Base Ligand

“…In particular, the incorporation of Mn(II) into metalorganic frameworks has received increasing attention in the fields of supramolecular chemistry and crystal engineering for the remarkable performances of the products in magnetical systems, catalysis and biochemistry [4,5]. Generally, the syntheses of MOFs are based on a self-assembly of organic ligands and metal ions or clusters, counterions, and solvent systems [6,7]. Among them, the design of organic ligands is the most important element for assembling MOFs with novel topologies.…”