A family of novel cationic ruthenium pincer complexes: Synthesis, characterization and catalytic activity in the transfer hydrogenation of ketones

Wang, Lei; Pan, Hai-Ran; Yang, Qin; Fu, Haiyan; Chen, Hua; Li, Ruixiang

doi:10.1016/j.inoche.2011.05.037

Cited by 16 publications

(1 citation statement)

References 25 publications

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“…Another complex of 3-bpp with pendant phenyl groups available in CSD, a heteroleptic ruthenium(II) complex with two thriphenylphosphine molecules (refcode UZEHIR) [50], also features a 'parallel-displaced' stacking interaction between the 3-bpp ligand and one of the phenyl groups of both of its PPh 3 . Moreover, the iron(II) complexes of 1-bpp [34], 1,3-bpp [17] and even of terpy [51][52][53][54] with the phenyl or related groups (such as p-tolyl [51], metoxyphenyl [53] or pyridyl [54]), despite clearly having different potential to their rotation, all suffer from similar 'twist' distortions with the θ values from 58.8 • [51] to 76.5 • [54], feature 'parallel-displaced' intramolecular stacking interactions ( Figure S8) and are HS (the exception being mesityl-substituted complexes of 1-bpp [19] and terpy [51] locked in their LS state either due to inductive [19] or steric [17] properties of the mesityl group).…”

Section: Stacking Interactionsmentioning

confidence: 99%

Intramolecular Spin State Locking in Iron(II) 2,6-Di(pyrazol-3-yl)pyridine Complexes by Phenyl Groups: An Experimental Study

et al. 2018

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Here we report a series of 1-phenyl-5-substituted 2,6-di(pyrazol-3-yl)pyridine complexes with iron(II) ion found in a high spin state in solids (according to magnetochemistry) and in solution (according to NMR spectroscopy), providing experimental evidence for it being an intramolecular effect induced by the phenyl groups. According to X-ray diffraction, the high spin locking of the metal ion is a result of its highly distorted coordination environment (with a very low ‘twist’ angle atypical of 2,6-di(pyrazol-3-yl)pyridine complexes), which remains this way in complexes with different substituents and counterions, in a diamagnetic zinc(II) analogue and in their solutions. Three possible reasons behind it, including additional coordination with the phenyl group, energy penalty incurred by its rotation or intramolecular stacking interactions, are addressed experimentally.

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Section: Stacking Interactionsmentioning

confidence: 99%

Intramolecular Spin State Locking in Iron(II) 2,6-Di(pyrazol-3-yl)pyridine Complexes by Phenyl Groups: An Experimental Study

et al. 2018

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s‐Triazine pincer ligands: Synthesis of their metal complexes, coordination behavior, and applications

Barakat

El‐Faham

Haukka

et al. 2021

Applied Organom Chemis

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Pincer ligands are interesting chelating agents due to their high ability to motivate the metal ion characteristics leading to diverse types of applications. These ligands and their metal complexes are smart materials which have a great impact in the development of diverse applications helped alot in the advancement of the field of coordination chemistry. In homogenous catalytic transformations, pincer ligands improved the chemical and thermal stability that serve to minimize the leaching of the metal during the catalytic cycle. Also, they offered the ability to fine‐tune the electronic properties for the metal center, thereby increasing the scope of their coordination chemistry and applications especially the pincer ligands comprising s‐triazine core. This review discusses some of the general synthetic protocols of these s‐triazine pincer ligands and their metal complexes with various applications in different fields. In addition, their structural diversity and the ligand coordination behaviors with different metal ions were also explored.

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Formation of C–C and C–N bonds through primary alcohol oxidation catalyzed by ruthenium(II) POCOP pincer complexes

Roque‐Ramires,

Restrepo‐Acevedo,

Cuenú‐Cabezas

et al. 2024

Applied Organom Chemis

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In this study, we present the successful application of new and known stable 16‐electron ruthenium(II) pincer complexes POCOP, based on the naphthoresorcinate backbone, [Ru(X)(POCOP)(CO)] (X = H, Cl, Br, I, OCOCF3), in the catalytic alkylation of ketones and the coupling between amines and primary alcohols under mild conditions. These protocols demonstrated tolerance to a wide range of alcohols, ketones, and anilines, with reactions proceeding in high conversions and selectivity towards the hydrogenated ketones and the imines. The use of an excess of alcohol as the proton source facilitated the formation of the hydrogenated products. These results mark a significant advancement in the development of catalytic reactions with ruthenium POCOP pincer derivatives.

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A family of novel cationic ruthenium pincer complexes: Synthesis, characterization and catalytic activity in the transfer hydrogenation of ketones

Cited by 16 publications

References 25 publications

Intramolecular Spin State Locking in Iron(II) 2,6-Di(pyrazol-3-yl)pyridine Complexes by Phenyl Groups: An Experimental Study

Intramolecular Spin State Locking in Iron(II) 2,6-Di(pyrazol-3-yl)pyridine Complexes by Phenyl Groups: An Experimental Study

s‐Triazine pincer ligands: Synthesis of their metal complexes, coordination behavior, and applications

Formation of C–C and C–N bonds through primary alcohol oxidation catalyzed by ruthenium(II) POCOP pincer complexes

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