Abstract
ABSTRACT Herein we report the development of two mixed-ligand ruthenium (II) complexes bearing phosphine and imine ligands, their thorough characterisation and their utilisation as homogeneous catalysts in Suzuki-type C–C cross-coupling reactions. Reactions of two tetradentate Schiff base ligands, derived from imidazole-2-carboxaldehyde and ethylenediamine (H2L1 ) or propylenediamine (H2L2 ), with [Ru(PPh3)3Cl2] in refluxing ethanol in the presence of NEt3 afforded two complexes of type [Ru(L1)(PPh3)2] and [Ru(L2)(PPh3)2], respectively. The solid-state structure of [Ru(L2)(PPh3)2] was determined by single crystal X-ray diffraction analysis. The molecular structure of [Ru(L1)(PPh3)2] was optimised by the DFT method. Electronic spectra of the complexes showed intense absorptions spanning over the visible and ultra-violet regions, the origin of which was probed with TDDFT calculations. Redox properties of the complexes were studied by cyclic voltammetry. These mixed-ligand ruthenium(II) complexes serve as efficient catalyst-precursors for Suzuki-type C–C cross-coupling reactions.
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