Two zinc (II) coordination polymers based on aliphatic ether Schiff base: Synthesis, crystal structure, antioxidation and fluorescence

Abstract

The synthesis of two 1D coordination polymers [Zn2L12]n 1 and [Zn2L22]n 2, based on the H2L1 (bis (salicylidene)‐3‐oxapentane‐1,5‐diamine) and the H2L2 (bis (5‐methylsalicylaldehyde)‐3‐oxapentane‐1,5‐diamine) ligands, have been described and characterized by IR, elemental analysis and X‐ray single crystal analyses. In coordination polymer 1, each Zn2+ ion is five‐coordinated by three oxygen atoms and two nitrogen atoms from deprotonated ligand forming a square pyramidal configuration. It is worth noting that phenolic oxygens of the deprotonated H2L1 adapt monodentate and monoatomic bridging coordinated modes resulting in one‐dimensional linear chain structure in which macro rings alternately connect small rings. The coordination polymer 2 is a four‐coordinated one‐dimensional zigzag chain in which geometric structure around the Zn (II) atom can be described as distorted tetrahedron. The antioxidant activity of the coordination polymers 1–2 and the ligands were determined by superoxide and hydroxyl radical scavenging method in vitro. The results demonstrated that the coordination polymers exhibit more effective antioxidant activity than the ligands. Moreover, compared with emissive bands of the free ligands in the solid state and DMF solvent, the photoluminescent transition of the Zn (II) coordination polymer 1–2 may be attributed to ligand‐to‐ligand charge‐transfer regulated by Zn (II) ion.

Dinuclear Zn(II) and tetranuclear Co(II) complexes of a tetradentate N2O2 Schiff base ligand: Synthesis, crystal structure, characterization, DFT studies, cytotoxicity evaluation, and catalytic activity toward benzyl alcohol oxidation

“…The synthesis and structural studies of polynuclear metal complexes with Schiff base ligands have increased in recent years because of their widespread applications in various fields such as catalysis, biological studies, and industrial systems …”

Synthesis, structure, and photoluminescent and electroluminescent properties of zinc(II) complexes with bidentate azomethine ligands

“…In recent years, zinc complexes of azomethine ligands [1][2][3][4][5][6] are increasingly used as an alternative to iridium complexes of active media in organic light-emitting diode (OLED) devices. [7][8][9][10] They are characterized by prominent thermal stability, high glass transition temperature, easy sublimation during the fabrication of amorphous films, the variability of structures, the relative simplicity of synthesis, and reasonable costs.…”

Modulation of Electronic Mobility of a One‐Dimensional Coordination Polymeric Molecular Wire with Light

“…Coordination polymers consist of metal cations linked by organic ligands, forming extensive repeating networks in one, two, or three‐dimensions. Coordination polymers have been of recent interest due to their rich structural chemistry arising from the fact that their physical and chemical properties are highly dependent on the choice of the coordinating ligands . In some varieties of coordination polymers, inorganic bridges and conjugated organic bridges allow the conduction of electrons along the network, through the interaction of the metal d ‐electrons with the ligand π‐electronic framework.…”

“…Coordinationp olymers have been of recent interest due to their rich structural chemistry arising from the fact that their physicala nd chemical properties are highly dependent on the choice of the coordinating ligands. [29][30][31][32][33][34] In some varieties of coordination polymers, inorganic bridges and conjugated organic bridges allow the conduction of electrons along the network, throught he interaction of the metal d-electrons with the ligand p-electronic framework. Conducting polymers hold as ignificant advantage over conventionalm etal-or metalloid-based conductors as they provideb etter control during the synthesis, allowing fine-tuning of the activities for their specific purpose.…”