Half-sandwich Ruthenium Complexes with Naphthalene-based Schiff Base Ligands:Syntheses, Characterization and Catalytic Activities for the Reduction of Nitroarenes

摘要

Three half-sandwich ruthenium(Ⅱ)p-cymene complexes containing naphthalene-based Schiff base ligands [Ru(p-cymene)LC1] (2a～2c) have been synthesized and characterized.Both Schiff-base ligands and ruthenium complexes were fully characterized by 1H and 13C NMR spectra,mass spectrometry and infrared spectrometry.The molecular structure of ruthenium complex 2b was confirmed by single-crystal X-ray diffraction methods.For the complex:C24H23CIN2ORu,Mr =524.02,monoclinic,space group P21/c,a =12.3888(4),b =17.3296(6),c =20.7744(7) (A),β =92.8000(10)°,V =4454.8(3) (A)3,Z =8,Dc =1.563 g/cm3,μ =0.936 mm-1,F(000) =2128,S =1.154,the final R =0.0309 and wR =0.0703.Moreover,these ruthenium complexes are active catalysts for the hydrogenation of nitroarenes to aromatic anilines in the presence of sodium tetrahydroborate (NaBH4) reducing agent.