Synthesis, Characterization, and Redox Reactions at the Solid–Liquid Interface of Submicron‐Size Ru(edta) Complex

A submicron‐sized colloidal ruthenium coordination compound was synthesized from a supersaturated solution of K[Ru III (Hedta)Cl] complex (edta 4− = ethylenediaminetetraacetate) using the antisolvent method. Electron microscopy (SEM/STEM) and spectroscopic (UV–vis and IR) studies revealed that the resulting submicron particles of K[Ru III (edta)(H 2 O)], denoted as K[Ru III (edta)(H 2 O)] SP , undergo ligand substitution with thiourea (TU) to form K[Ru III (edta)(TU)] SP , as well as redox reaction with hydrogen peroxide (H 2 O 2 ) yielding K[Ru V (edta)(O)] SP at the solid–liquid interface of a multiphase system. Furthermore, K[Ru III (edta)(H 2 O)] SP exhibited catalytic activity toward oxidative degradation of methylene blue (MB) in the presence of H 2 O 2 . The present study demonstrates that the characteristic coordination and redox reactivity of the Ru(edta) system are retained upon conversion to submicron particles, providing a model platform for investigating transition metal complex chemistry at solid‐liquid interfaces.