A new water-soluble Rh(III)-Salophen complex as efficient catalyst for alcohol oxidation in aqueous medium
A new water-soluble rhodium(III) complex [Rh(η4-L)Cl] (1a) was synthesized by reacting RhCl3.3H2O with Salophen ligand [L = N,N′-bis(salicylidene)-1,2-phenylenediamine (a)] in 1:1 molar ratio in dichloromethane solution. The complex 1a was characterized by FT-IR, UV-Vis, ESI-MS, 1H and 13C NMR spectroscopy. Theoretical calculations (B3LYP) and spectroscopic evidence recommends that the ligand a coordinates to the Rh centre through imine N and phenolic O donor atoms. The complex 1a emerged out to be an effective catalyst for oxidation of alcohols in water. Magnificent yields of carbonyl compounds are acquired for a comprehensive assortment of substrates with H2O2 as oxidant at a relatively low loading of catalyst. Thus, the Rh(III)-H2O-H2O2 catalytic system could act as an environmentally benign alternative to oxidation methods in conventional organic solvents.
Rhodium(III) complex; Salophen; Water-soluble; DFT Calculation; Aqueous catalysis
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