Ruthenium and Osmium Complexes Containing NHC and π-Acid Ligands

Elsevier eBooks, Год журнала: 2022, Номер unknown, С. 444 - 527

Опубликована: Янв. 1, 2022

Язык: Английский

Mononuclear and dinuclear (pyridyl) dicarboxamide Ru(II) hydrido complexes: Ligand controlled coordination diversity and catalytic transfer hydrogenation of ketones

Journal of Organometallic Chemistry, Год журнала: 2023, Номер 1005, С. 122970 - 122970

Опубликована: Ноя. 30, 2023

Reactions of ligand N,N-(1,4-phenylene)-dipicolinamide (H2L1), with [Ru(PPh3)3(CO)HCl] produced the dinuclear complex [Ru2(H2L1)(PPh3)4(CO)2H2]2+[2Cl−]− (Ru1). On other hand, treatments N,N-(1,2-phenylene)-dipicolinamide (H2L2), two and one molar equivalents afforded mononuclear complexes [Ru2(HL2)(PPh3)3(CO)3HCl2] (Ru2) [Ru(HL2)(PPh3)2(CO)H] (Ru3) respectively. The identities structures Ru1-Ru3 were established using NMR, FT-IR spectroscopic techniques, mass spectrometry, elemental analyses. displayed high catalytic activities in transfer hydrogenation a wide range ketones. hydride Ru1 was most active, while Ru2 more active than analogous Ru3. 31P NMR analyses reaction intermediates used to propose monohydride pathway reactions involving dissociation PPh3 ligand.

Язык: Английский

Assembled Porphyrin‐Based Multinuclear Ruthenium(II)‐NNNN Complex Catalysts for Transfer Hydrogenation of Ketones

European Journal of Inorganic Chemistry, Год журнала: 2022, Номер 26(6)

Опубликована: Дек. 8, 2022

Abstract Multinuclear porphyrin‐based ruthenium(II)‐NNNN complexes were efficiently assembled by means of coordinatively unsaturated 16‐electron mononuclear ruthenium(II)‐pyrazolyl‐imidazolyl‐pyridine complex, zinc(II) meso ‐tetra(4‐pyridyl)‐porphyrin (ZnTPyP), and 4,4′‐linked bipyridines. The resultant multinuclear (Ru 4 Ru 8 ) exhibited exceptionally high catalytic activity at as low 0.008 mol % loading for the transfer hydrogenation reaction ketones in refluxing 2‐propanol, reaching up to 99 yields 5.7×10 6 h −1 TOFs.

Язык: Английский