Synthesis, spectral characterization, crystal structures, biological activities, theoretical calculations and substitution effect of salicylidene ligand on the nature of mono and dinuclear Zn(II) Schiff base complexes

Experimental and Theoretical Studies of Novel Cadmium(II) N2O-Schiff Base Complexes: Synthesis, Spectroscopic Characterization, X-ray Crystal Structure, and Fluorescent Properties

Three 2,6-dimethoxyaniline Schiff base cadmium(II) complexes were synthesized via a one-pot reaction and characterized by spectroscopic methods (NMR, FT-IR, EA), X-ray crystallography, SEM/EDX and fluorescent spectroscopy. The molecular structures of complexes 1-3 were elucidated by X-ray crystallography, revealing penta-coordinated cadmium(II) centers with distorted square-pyramidal geometries. Mononuclear molecules form supramolecular structures through intermolecular C-H···Cl interactions and π···π stacking interactions, which further stabilize the structures of the complexes. DFT calculations were performed to analyze the electronic structures and frontier molecular orbitals. The fluorescence properties of complexes 1-3 were investigated in both solid-state and solution, exhibiting characteristic emission bands. The study provides insights into the structural and luminescent properties of these cadmium(II) complexes, demonstrating their potential applications as luminescent materials.

Metallo-Organic Complexes Containing Transition Metals; Synthetic Approaches and Pharmaceutical Aspects

Coordination compounds offer a flexible framework for the thoughtful design of novel therapeutic-metallodrugs because of the unique properties of metal ions, such as their ability to coordinate with a wide range of organic ligands, variable oxidation states, a wide range of geometries, and coordination numbers. The pharmaceutical potential of a metal ion and associated substances is validated by the prevalence of various disease states linked to a metal ion's excess or deficiency within the biological system. Researchers have sought more selective, efficacious metallodrugs that cause fewer adverse effects. Attempts have resulted in considering a large range of organic ligands, preferably polydentate ligands with demonstrated biological activity, and a large range of metals from the periodic table, primarily from the d-block. In this review, we have outlined the key coordination complexes comprising N-, O-, and S-donor ligands reported in the last six years to demonstrate the potential applications of these metallo-organic complexes. The synthetic pathways of ligands, their complexes, and their potential for therapeutic applications are highlighted.

Metal Complexes with Schiff Bases: Data Collection and Recent Studies on Biological Activities

Metal complexes play a crucial role in pharmaceutical sciences owing to their wide and significant activities. Schiff bases (SBs) are multifaceted pharmacophores capable of forming chelating complexes with various metals in different oxidation states. Complexes with SBs are extensively studied for their numerous advantages, including low cost and simple synthetic strategies. They have been reported to possess a variety of biological activities, including antimicrobial, anticancer, antioxidant, antimalarial, analgesic, antiviral, antipyretic, and antidiabetic ones. This review summarizes the most recent studies on the antimicrobial and antiproliferative activities of SBs-metal complexes. Moreover, recent studies regarding mononuclear and binuclear complexes with SBs are described, including antioxidant, antidiabetic, antimalarial, antileishmanial, anti-Alzheimer, and catecholase activities.