Advancements in Microwave–Assisted Synthesis of Schiff Bases and Their Metal Complexes: A Green and Efficient Approach: A Review

Schiff bases, distinguished by their imine (-C=N-) functional group, have gained substantial interest due to their diverse applications in medicinal chemistry, catalysis, and materials science. These compounds are commonly synthesized through the condensation of primary amines with aldehydes or ketones and play a crucial role as ligands in forming metal complexes with enhanced biological and catalytic properties. However, conventional synthesis methods often involve extended reaction times, harsh conditions, and excessive solvent use, necessitating the adoption of more sustainable alternatives. Microwave-assisted synthesis (MAS) has emerged as an effective strategy in green chemistry, offering notable advantages such as accelerated reaction rates, improved yields, and energy efficiency. By employing microwave irradiation, this technique enhances reaction kinetics through uniform heating, reducing unwanted side reactions and minimizing solvent consumption. Recent research has shown that MAS enables the environmentally friendly and efficient synthesis of Schiff bases and their metal complexes, ensuring better product purity and crystallinity. An in-depth analysis of recent studies underscores the efficiency of MAS in Schiff base synthesis, emphasizing its contribution to green and sustainable chemistry. In comparison to conventional techniques, MAS significantly shortens reaction durations while maintaining high selectivity and product yields. Additionally, its potential for solvent-free synthesis aligns with eco-friendly practices. This review explores the latest advancements in microwave-assisted synthesis of Schiff bases and their metal complexes, focusing on structural characterization, practical applications, and emerging research directions. The integration of MAS with other green chemistry methodologies is expected to further enhance the sustainability and effectiveness of Schiff base chemistry, making it a promising area for future exploration.