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A new bridging agent, 4-amino-2-anilinopyridine (aap), was synthesized and used as an equatorial ligand in the preparation of a diruthenium complex (4,0) Ru2(aap)4Cl. Both the ligand and the diruthenium complex were characterized by thermal analysis, MALDI-TOF mass spectrometry, IR and NMR (1H and13C) spectroscopy, and X-ray crystallography. The structural analysis revealed that the complex existed as a (4,0) isomer, in which the amino group on the pyridyl moiety was not involved in chemical bonding. [ABSTRACT FROM AUTHOR]

Three new diruthenium(III) complexes, [Ru2O(2-sb)2(2,2′-bipy)2(H2O)2]·2.5H2O (1), [Ru2O(3-sb)2(2,2′-bipy)2(H2O)2]·9H2O (2), and [Ru2O (4-sb)2(2,2′-bipy)2(H2O)2]·9H2O (3), where sb2−is sulfobenzoate dianion and 2,2′-bipy is 2,2′-bipyridine, were synthesized using hydrothermal methods and characterized by IR, elemental analysis, thermogravimetric analysis, UV–vis, and fluorescence spectra. The single crystal X-ray analysis showed that each of these complexes has a dinuclear core stabilized by two bridging carboxylates and one bridging O2−. Variable sb2−ligands (2-sb, 3-sb, and 4-sb) in these complexes lead to diverse electronic spectroscopic behavior. The efficiency of activating methyl phenyl sulfide oxidation utilizing H2O2in 3 equiv. was studied at 23 ± 2 °C. The effect of the amount of catalyst and solvents on activities was investigated. Under optimized reaction conditions, the major product was sulfoxide. Complex1gave significant conversion of 100 and 98% selectivity for sulfoxide after 4 h. [ABSTRACT FROM AUTHOR]