Ru(III) mediated CH bond activation of N-(naphthyl)salicylaldimine and related Schiff base ligands: Synthesis, structure, DFT study and catalytic activity
Abstract New family of cyclometalated ruthenium(III) Schiff base complexes of the general composition [Ru(L ON )(L CNO )(EPh 3 )] (L=Schiff base ligands of CNO- and ON-donors; E=P, As) have been synthesized and characterized by elemental analysis, FT–IR, UV–Vis and EPR spectral methods. The molecular structure of one of the complexes [Ru(L ON )(L CNO )(PPh 3 )] ( 5 ) was determined by X-ray crystallography. The Schiff base ligands readily undergo cyclometalation with the ruthenium metal precursor by CH activation at the peri -position. These Schiff base ligands coordinated to metal center as di-anionic tridentate CNO-donor and bi-dentate ON-donor in these cycloruthenium complexes. TD–DFT calculations were also carried out for the complex ( 5 ). The catalytic activity of the complex [Ru(L ON )(L CNO )(PPh 3 )] ( 5 ) was performed and found to be an efficient catalyst for the transfer hydrogenation of ketones with excellent conversion in the presence of i -PrOH/KOH at 80°C in 2h. Highlights Cyclometalated Ru(III) complexes containing both tridentate and bi-dentate Schiff base ligands have been synthesized. Structure of one of the complex was confirmed by single crystal XRD. DFT study The complex efficiently catalyzes the transfer hydrogenation of ketones in to alcohols. Graphical abstract [DISPLAY OMISSION]
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