Synthesis and characterization of ruthenium ‘pincer’ complexes containing sulfur atom donor ligands. The X-ray crystal structure of [RuCl2(η3-NN′N)(SMe2)] (NN′N={2,6-(Me2NCH2)2C5H3N})

Rı́o, Ignacio del; Gossage, Robert A.; Lutz, Martin; Spek, Anthony L.; Koten, Gerard van

doi:10.1016/s0020-1693(98)00418-6

Cited by 5 publications

(1 citation statement)

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“…Our approach includes using pincer ligands with amide donors (Scheme ), in particular, those that can promote a reactive square-planar geometry with possible bifunctional behavior. With this in mind, we chose to investigate first-row transition metal derivatives of the diamino–pyridine ligand, which has been employed for a relatively limited number of transition metals (e.g., Ti, Zr, Re, Ru, Pd) − and theoretically allows for square-planar coordination with a monodentate coligand, in both neutral (protonated) and dianionic forms. This ligand is closely related to the successful di-imino–pyridine ligand, which is well-known to be redox-active, and the bis(arylcarboxamido) pyridine ligand, assumed to be redox and chemically innocent. − …”

Section: Introductionmentioning

confidence: 99%

Syntheses and Reactivity Studies of Square-Planar Diamido–Pyridine Complexes Based on Earth-Abundant First-Row Transition Elements

et al. 2015

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The new square-planar complexes M[NNN](pyridine) (M = Fe (1), Co(2); NNN = 2,6-bis(2,6-diisopropylphenylamidomethyl)pyridine) were synthesized and fully characterized to investigate small molecule activation on this platform and also associated ligand innocence. The equatorial pyridine solvent moiety could not be removed; a new bis-ligand species Co[NNN.H]2 (3) was synthesized in low yield while attempting to make the base-free derivative. Attempts to prepare the Ni analogue of 1 and 2 instead yielded crystals of a di-imino-pyridine complex Ni[PDI]Cl (4) (PDI = 2,6-bis(2,6-diisopropylphenyliminomethyl)pyridine), following loss of methylene backbone hydrogen atoms. Structural analysis indicates that the PDI ligand is a mono-anionic radical. This susceptibility of the ligand to oxidative dehydrogenation was also shown when the reaction of 2 with 2 equiv of trityl chloride yielded a new complex with an asymmetric imino-amino pyridine ligand Co[NNN']Cl2 (5) (NNN' = 2-(2,6-(diisopropylphenyliminomethyl)-6-(diisopropylphenylamidomethyl)-pyridine) in good yield.

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