Synthesis and characterization of piano-stool ruthenium complexes with N,N′-pyridine imine bidentate ligands and their application in styrene oxidation

The new complexes [(eta(6)-arene)RuCl(C5H4N-2-CH=N-R)]PF6 (arene = C6H6 with R = 4-flourophenyl (1), 4-chlorophenyl (2), 4-bromophenyl (3), 4-iodophenyl (4), 2, 5-dichlorophenyl (5) or p-cymene with R = 4-flourophenyl (6), 4-chlorophenyl (7), 4-bromophenyl (8), 4-iodophenyl (9), 2, 5-dichlorophenyl (10)) have been synthesized by reacting the ruthenium arene precursors [(eta(6)-arene)Ru(m-Cl) Cl](2), with the N,N'-bidentate ligands in a 1: 2 ratio. Full characterization of all complexes was accomplished using H-1 and C-13 NMR, elemental analyses, UV-Vis spectroscopy, thermal analysis, IR spectroscopy and single crystal x-ray structures for compounds 7 and 10. The single crystal structures confirmed coordination of the ligand to the ruthenium(II) centre. The Ru(II) centre has a pseudo-octahedral three legged piano stool geometry in which the arene ring occupies the apex of the stool and the ruthenium is coordinated to the N,N'-bidentate ligand and a chloride ligand at the base of the stool. Two polymorphs of 7 were identified. The synthesized Ru(II) complexes were tested as catalysts for the oxidation of styrene to benzaldehyde using NaIO4 as a co-oxidant. All complexes were active catalysts for styrene oxidation and they gave high yields of benzaldehyde as the major product. (C) 2016 Elsevier B.V. All rights reserved.