Thiazole-Containing Schiff Base Ligands and Their Transition-Metal Complexes: Design, Synthesis, Coordination Chemistry, and Biological Importance

Author(s): Dr. AS Tekale

Abstract:

Schiff bases derived from the 1,3-thiazole nucleus constitute one of the most versatile ligand families in modern coordination and medicinal chemistry. The fusion of an aromatic, electron-rich, sulfur- and nitrogen-bearing heterocycle with a readily formed azomethine (–CH=N–) linkage yields compounds that are inexpensive to prepare, structurally programmable, and able to chelate essentially the entire first transition series through nitrogen, oxygen, and sulfur donors. This review provides a comprehensive account of the field. We begin with the structure and synthesis of the thiazole ring and the mechanism of azomethine formation, then present a systematic classification of thiazole Schiff bases by their synthetic origin, denticity, and hybrid architecture. Synthetic methodologies are surveyed with emphasis on green and energy-efficient routes (microwave, ultrasonic, mechanochemical, nanocatalytic, and alternative-media techniques) and their green-chemistry metrics. The coordination behaviour of these ligands—donor sets, denticity, geometry, and complex stability—is discussed alongside the full analytical toolbox used for characterization. The core of the review examines biological importance in depth: antibacterial, antifungal, anticancer, antioxidant, anti-inflammatory, antidiabetic, antitubercular, antimalarial, antiviral, and enzyme-inhibitory activities, each with its mechanistic rationale and representative examples. Structure–activity relationships, non-biological applications (chemosensing, catalysis, corrosion inhibition, and materials), in-silico methods (DFT, docking, molecular dynamics, ADMET), and toxicity considerations are also treated. We close with the principal challenges and future directions for the field.

keywords:
Thiazole; Schiff base; azomethine; coordination chemistry; transition-metal complexes; green synthesis; chelation theory; antimicrobial; anticancer; antioxidant; DNA binding; molecular docking; SAR

Pages: 187-191     |    11 View     |    1 Download