Influence of ligand field strength on the kinetics of transition metal-catalyzed reactions

Abstract

This study investigates the influence of ligand field strength on the kinetics of transition metal-catalyzed reactions, emphasizing how ligand-induced modifications in the electronic structure of metal complexes affect reaction rates and mechanisms. By utilizing Ligand Field Theory (LFT) and Density Functional Theory (DFT) calculations, the research explores the relationship between ligand field splitting, activation energies, and the stability of reaction intermediates. Strong-field ligands, such as CO and CN⁻, are shown to induce significant d-orbital splitting, leading to lower activation energies and faster reaction rates. In contrast, weak-field ligands like H₂O and Cl⁻ result in higher activation energies and slower kinetics. Case studies, including the Ziegler-Natta polymerization and hydroformylation reactions, highlight the practical implications of these findings in catalysis. Additionally, computational studies provide insights into the electron density distribution and potential energy surfaces, demonstrating how ligand field strength can be optimized to enhance catalytic efficiency. The research underscores the critical role of ligand field strength in determining the reactivity of transition metal complexes, offering valuable guidance for the design of more effective catalysts in industrial and synthetic chemistry.