Ruthenium complexes containing pyridine-2,6-dicarboxylato ligands

Characterization of a Mixed-Valence Ru(II)/Ru(III) Ion-Pair Complex. Unexpected High-Frequency Electron Paramagnetic Resonance Evidence for Ru(III)–Ru(III) Dimer Coupling

“…28 cm –1 ) from the free ligand shows the coordination of the ring nitrogen to Ru­(III). The weak bands observed in the 3100–2850 cm –1 range can be assigned to ν­(CH) vibrations of both the pyridine ring. , …”

“…The weak bands observed in the 3100−2850 cm −1 range can be assigned to ν(CH) vibrations of both the pyridine ring. 37,38 ESI-MS measurements were performed to identify the nature of the mixed-valence ion-pair in aqueous solution. The recorded spectra along with the spectra simulated using an open-source software 39 for the suggested species are shown in Figure 6.…”

Synthesis and reactivity of ruthenium(II) complexes with 1,5-cyclooctadiene and pyridine-2,6-dicarboxylato ligands

“…To date, pyridine-2,6-dicarboxylato ligands in ruthenium complexes have four coordination modes as j 3 -dipic, j 2 -dipic, j 2 -dipicH and l-j 1 ,j 2 -dipic [7][8][9][10][11][12][13][14][15]. (8)) with the moderate yields, the water ligand in 2 was easily substituted by the various N-donor ligands, indicating a more intense interaction between RuAN bonds compared to the RuAO bond [21].…”

“…A number of first-row transition metal complexes containing dipicolinic acid have been well documented to date; however, complexes of ruthenium containing dipicolinic acid are rather underdeveloped [7][8][9][10][11][12][13][14]. As part of our ongoing studies on the synthesis of organometallic complexes with the redox-active ruthenium complexes [15], we are especially interested in the synthesis of ruthenium complexes with N-hetero-aromatic carboxylic acids that are planar and rigid and typically able to chelate the ruthenium centers. To be able to prepare such ruthenium complexes of this type, we first reacted one of those ligands, 2,6-pyridinedicarboxylic acid (H 2 dipic), with the ruthenium 1,5-cyclooctadiene (COD) [Ru(COD)Cl 2 ] x in the presence of organic base, resulting in the isolation of a stable anionic complex [Et 3 NH][(dipic)(COD)RuCl] with a tris-chelating dipic 2À ligand and a terminal chloride; a versatile staring material which allows for a new synthetic route to a wide variety of new ruthenium(II) complexes supported by both dipic and COD as co-ligands.…”

Synthesis, Electrochemical Characterization, and Water Oxidation Chemistry of Ru Complexes Containing the 2,6-Pyridinedicarboxylato Ligand

“…The characterization data matches with reported complex. 20 II . In a 100 mL two neck round bottom flask, [Et3NH][Ru II (pdc-ҡ 3 -N 1 O 2 )(DMSO)2Cl], 1 II (560 mg, 1 mmol) and 2,2´-bipyridine (156 mg, 1 mmol) were dissolved in 40 mL degassed methanol solvent and refluxed for 4 hours under N2 atmosphere.…”