Ruthenium complexes with naphthyridine ligands. Synthesis, characterization and catalytic activity in oxidation reactions †

Redox Equilibration Observed for the Reduction of a Ruthenium(III) Complex by Ascorbate under Low‐Driving‐Force Conditions

“…(i) The symmetry of the coordination sphere is C 2 h and one can expect nine (three stretching and six bending) vibrational modes for the {RuCl 2 O 2 N 2 } fragment active in the IR spectra. (ii) Ru–Cl and Ru–N vibrations usually occur in the same infrared region , . Recent data from both experimental, and theoretical (DFT) studies show the following order of the ruthenium‐ligand IR spectroscopic vibrations, Ru–N > Ru–O > Ru–Cl, contrary, in part, to older data , .…”

Synthesis and characterization of new complexes of the type [Ru(CO)2Cl2 (2‐phenyl‐1,8‐naphthyridine‐kN) (2‐phenyl‐1,8‐naphthyridine‐kN′)]. Preliminary applications in homogeneous catalysis

“…The selection of the solvent is crucial in order to modify the reaction product. For instance, in previous work [16] we had [Ru(CO) 2 et al [18] have reported the effects that coordinating solvents, such as water or acetonitrile, can provide in the coordination of 1,8-naphthyridine. Whereas the 1,8-naphthyridine in alcohol acts as a chelating ligand, in water or acetonitrile it acts as a monocoordinating ligand.…”

“…[17] Besides, complexes such as Ru 2 (dmnapy)Cl 4 (where dmnapy = 2,7-dimethoxy-1,8-naphthyridine) have been found to be active in the catalytic oxidation of alcohols and the epoxidation of trans-stilbene. [18] Supported by these arguments, we report here the synthesis of new ruthenium-carbonyl complexes derived from 2-phenyl-1,8-naphthyridine-type ligands, including their first application as homogeneous catalysts in the hydroformylation of styrene…”

Catalysis of the Electrooxidation of Biomass-Derived Alcohol Fuels

“…22 Related binuclear Ru complexes such as [Ru 2 (napy) 2 (H 2 0) 4 Cl(OH)][C10 4 ] (napy = 1,8-naphthyridine) have also been shown to be catalysts for the oxidation of primary and secondary alcohols, although the oxidation chemistry was complicated by the instability of the complexes. 23 The binuclear Ru complex (LoMe)(HO)Ru IV (μ-0) 2 Ru IV (OH) (LoMe) where L0Me = [CpCo{P(0)(OMe) 2 } 3 ]" also serves to oxidize alcohols, with a further electrooxidation step of formaldehyde to formate also accessible. 24…”