Bidentate forms of β-triketimines: syntheses, characterization and outstanding performance of enamine–diimine cobalt complexes in isoprene polymerization

2016 ◽  
Vol 45 (25) ◽  
pp. 10435-10446 ◽  
Author(s):  
Mohammed N. Alnajrani ◽  
Francis S. Mair
Keyword(s):  
Active Catalyst ◽  
Cobalt Complexes ◽  
Isoprene Polymerization

When a normally tridentate β-triketimine ligand binds to Co(ii) in a bidentate enamine–diimine form, is partnered with the weakly co-ordinating BArF anion and activated with ethylaluminiumsesquichoride, the most active catalyst yet found forcis-1,4-selective polymerization of isoprene results.

One-pot synthesis of cobalt complexes with 2,6-bis(arylimino)phenoxyl/phenthioxyl ligands and catalysis on isoprene polymerization

2021 ◽  
Vol 50 (15) ◽  
pp. 5218-5225
Author(s):  
Xue-Meng Chen ◽  
Li-Cheng Huang ◽  
Wei Gao
Keyword(s):  
Mixed Valence ◽  
Cobalt Complexes ◽  
One Pot ◽  
One Pot Synthesis ◽  
Isoprene Polymerization

Several cobalt complexes supported by 2,6-bis(arylimino)phenoxyl/phenthioxyl ligands κ2N,X-Ar[NXN]CoCl(THF) were synthesized by direct oxygen(sulfur) insertion into the C–Co bond of the mixed-valence cobalt complexes {κ2C,N,η6-Ar[NCN]Co-κN-CoCl(μ-Cl)}2.

Alpha and beta diimine cobalt complexes in isoprene polymerization: a comparative study

RSC Advances ◽  
2016 ◽  
Vol 6 (114) ◽  
pp. 113803-113814 ◽  
Author(s):  
Mohammed N. Alnajrani ◽  
Sultan A. Alshmimri ◽  
Omar A. Alsager
Keyword(s):  
Comparative Study ◽  
Cobalt Catalyst ◽  
Cobalt Complexes ◽  
Isoprene Polymerization

Isoprene was polymerized by diimine cobalt catalyst in the presence of DEAC to produce cis-1,4 and 3,4 polyisoprene.

Synthesis of characteristic polyisoprenes using rationally designed iminopyridyl metal (Fe and Co) precatalysts: investigation of co-catalysts and steric influence on their catalytic activity

2020 ◽  
Vol 44 (19) ◽  
pp. 8076-8084 ◽  
Author(s):  
Wenhua Lin ◽  
Liping Zhang ◽  
Hongyi Suo ◽  
Arumugam Vignesh ◽  
Nighat Yousuf ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Cobalt Complexes ◽  
Co Catalysts ◽  
Isoprene Polymerization ◽  
Steric Influence

A series of iminopyridyl ligand-based iron and cobalt complexes are utilized as catalysts in isoprene polymerization, in which the microstructure of resultant polyisoprenes was investigated.

Soluble neodymium chloride 2-ethylhexanol complex as a highly active catalyst for controlled isoprene polymerization

Polymer ◽  
2007 ◽  
Vol 48 (9) ◽  
pp. 2470-2474 ◽  
Author(s):  
Changyou Ren ◽  
Guilian Li ◽  
Weimin Dong ◽  
Liansheng Jiang ◽  
Xuequan Zhang ◽  
...  
Keyword(s):  
Active Catalyst ◽  
Highly Active ◽  
Neodymium Chloride ◽  
Isoprene Polymerization

Cobaloxime-Based Double Complex Salts as Efficient and Versatile Catalysts for the Light-Driven Hydrogen Evolution Reaction

2020 ◽  
Author(s):  
Elisabeth Hofmeister ◽  
Jisoo Woo ◽  
Tobias Ullrich ◽  
Lydia Petermann ◽  
Kevin Hanus ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Systematic Study ◽  
Cobalt Complexes ◽  
Spectroscopic Studies ◽  
Double Complex ◽  
Double Complex Salts ◽  
Noble Metal Catalysts ◽  
Reduction Potentials ◽  
Complex Salts

Cobaloximes and their BF<sub>2</sub>-bridged analogues have emerged as promising non-noble metal catalysts for the photocatalytic hydrogen evolution reaction (HER). Herein we report the serendipitous discovery that double complex salts such as [Co(dmgh)<sub>2</sub>py<sub>2</sub>]<sup>+</sup>[Co(dmgBPh<sub>2</sub>)<sub>2</sub>Cl<sub>2</sub>]<sup>-</sup> can be obtained in good yields by treatment of commercially available [Co(dmgh)<sub>2</sub>pyCl] with triarylboranes. A systematic study on the use of such double complex salts and their single salts with simple counterions as photocatalysts revealed HER activities comparable or superior to existing cobaloxime catalysts and suggests ample opportunities for this compound class in catalyst/photosensitizer dyads and immobilized architectures. Preliminary electrochemical and spectroscopic studies indicate that one key advantage of these charged cobalt complexes is that the reduction potentials as well as the electrostatic interaction with charged photosensitizers can be tuned.

scholarly journals Paramagnetic solid-state NMR assignment and novel chemical conversion of the aldehyde group to dihydrogen ortho ester and hemiacetal moieties in copper(ii)- and cobalt(ii)-pyridinecarboxaldehyde complexes

RSC Advances ◽  
2021 ◽  
Vol 11 (33) ◽  
pp. 20216-20231
Author(s):  
Ayelén F. Crespi ◽  
Verónica M. Sánchez ◽  
Daniel Vega ◽  
Ana L. Pérez ◽  
Carlos D. Brondino ◽  
...  
Keyword(s):  
Solid State ◽  
Solid State Nmr ◽  
Nmr Assignment ◽  
Cobalt Complexes ◽  
Chemical Conversion ◽  
Aldehyde Group ◽  
Ortho Ester ◽  
Complex Chemical ◽  
Chemical Functionalization

The complex chemical functionalization of the aldehyde group was elucidated in copper and cobalt complexes for 4- and 3-pyridinecarboxaldehyde ligands.

scholarly journals Structural, Magnetic, and Electrochemical Characterization of Iron(III) and Cobalt Complexes with Penta‐N 3 O 2 ‐dentate Ligands

2021 ◽  
Vol 2021 (15) ◽  
pp. 1498-1504
Author(s):  
Dominik Natke ◽  
Annika Preiss ◽  
Stephen Klimke ◽  
Takuya Shiga ◽  
Roman Boca ◽  
...  
Keyword(s):  
Cobalt Complexes ◽  
Electrochemical Characterization

Bis(tetramethylaluminate) Lanthanide Complexes Supported by Amidinate Ligands with a Pendant Ph2P═X (X = O, S) Group: Application in Isoprene Polymerization

2021 ◽  
Author(s):  
Olesya A. Basalova ◽  
Aleksei O. Tolpygin ◽  
Tatyana A. Kovylina ◽  
Anton V. Cherkasov ◽  
Georgy K. Fukin ◽  
...  
Keyword(s):  
Lanthanide Complexes ◽  
Isoprene Polymerization
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