Pyridinylimine-based nickel(II) and palladium(II) complexes: preparation, structural characterization and use as alkene polymerization catalysts

Laine, Timo V.; Piironen, Ulla; Lappalainen, Kristian; Klinga, Martti; Aitola, Erkki; Leskelä, Markku

doi:10.1016/s0022-328x(00)00291-6

Cited by 238 publications

(160 citation statements)

References 46 publications

Supporting

Mentioning

141

Contrasting

Unclassified

Order By: Relevance

“…Ligand L3 was synthesized with a few drops of concentrated H 2 SO 4 as catalyst, and anhydrous Na 2 SO 4 was used to remove the water formed during the reaction according to the literature [21]. All the ligands were identified by FT-IR, elemental analysis, and NMR spectra.…”

Section: Synthesis and Characterization Of Iminopyridine Ligands (L1-mentioning

confidence: 99%

Iminopyridine-Based Cobalt(II) and Nickel(II) Complexes: Synthesis, Characterization, and Their Catalytic Behaviors for 1,3-Butadiene Polymerization

et al. 2016

View full text Add to dashboard Cite

A series of iminopyridine ligated Co(II) (1a-7a) and Ni(II) (1b-7b) complexes were synthesized. The structures of complexes 3a, 4a, 5a, 7a, 5b, and 6b were determined by X-ray crystallographic analyses. Complex 3a formed a chloro-bridged dimer, whereas 4a, 5a, and 7a, having a substituent (4a, 5a: CH 3 ; 7a: Br) at the 6-position of pyridine, producing the solid structures with a single ligand coordinated to the central metal. The nickel atom in complex 5b features distorted trigonal-bipyramidal geometry with one THF molecule ligating to the metal center. All the complexes activated by ethylaluminum sesquichloride (EASC) were evaluated in 1,3-butadiene polymerization. The catalytic activity and selectivity were significantly influenced by the ligand structure and central metal. Comparing with the nickel complexes, the cobalt complexes exhibited higher catalytic activity and cis-1,4-selectivity. For both the cobalt and nickel complexes, the aldimine-based complexes showed higher catalyst activity than their ketimine counterparts.

show abstract

Section: Synthesis and Characterization Of Iminopyridine Ligands (L1-mentioning

confidence: 99%

Iminopyridine-Based Cobalt(II) and Nickel(II) Complexes: Synthesis, Characterization, and Their Catalytic Behaviors for 1,3-Butadiene Polymerization

et al. 2016

View full text Add to dashboard Cite

show abstract

“…Complexes can be isolated as mononuclear species or, depending on both the metal halides and the degree of substitution of the pyridine ring, as centrosymmetric dinuclear molecules. [8][9][10][11] By simple modifications of the iminopyridyl architecture, the polymerization and/or oligomerization activities of the metal complexes can be tuned. All these merits make this class of complexes advantageous over other types of metal catalyst, such as metallocenes or geometry constrained species [12][13][14][15] .…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of some water soluble Zn(ii) complexes with (E)-N-(pyridin-2-ylmethylene)arylamines that regulate tumour cell death by interacting with DNA

et al. 2014

View full text Add to dashboard Cite

The synthesis and spectroscopic properties of nine water soluble zinc(II) complexes of (E)-N-(pyridin-2-ylmethylene)arylamines (Ln) with the general formula [Zn(X)2(Ln)] (X = Cl−, Br−, I−; (1-8)) and [Zn(-N3)-(N3)(L3)]2 (9) are reported. The complexes were characterized by elemental analysis and their spectroscopic properties were studied using UV-Visible, fluorescence, IR and 1H NMR spectroscopies. The solid state structures of zinc(II) complexes 2-4 and 6-9 were established by single crystal X-ray crystallography. The majority of the structures are mononuclear with tetra-coordinate zinc centres (2-4, 6 and 7) except where L carries an additional donor atom capable of coordinating zinc (8), in which case the zinc atom has a distorted square pyramidal geometry. The centrosymmetric molecule of [Zn(-N3)(N3)(L3)]2 (9) is binuclear with the zinc atoms in a trigonal bipyramidal coordination environment. In general, the dichlorozinc derivatives 1, 3-5 and 8 exhibited moderately elevated in vitro cytotoxic potency towards the human epithelial cervical carcinoma (HeLa) cell line, with 4 as the best performer (IC50 value of 18 M). Apoptosis-inducing activity, assessed by the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay, showed that the zinc complexes interacted with DNA and thereby interfered the DNA binding of several transcription factors to its promoter sites, thus inhibiting gene transcription required for the biological activity of cells. Accepted ManuscriptThis is an Accepted Manuscript, which has been through the RSC Publishing peer review process and has been accepted for publication.Accepted Manuscripts are published online shortly after acceptance, which is prior to technical editing, formatting and proof reading. This free service from RSC Publishing allows authors to make their results available to the community, in citable form, before publication of the edited article. This Accepted Manuscript will be replaced by the edited and formatted Advance Article as soon as this is available.To cite this manuscript please use its permanent Digital Object Identifier (DOI®), which is identical for all formats of publication.More information about Accepted Manuscripts can be found in the Information for Authors.Please note that technical editing may introduce minor changes to the text and/or graphics contained in the manuscript submitted by the author(s) which may alter content, and that the standard Terms & Conditions and the ethical guidelines that apply to the journal are still applicable. In no event shall the RSC be held responsible for any errors or omissions in these Accepted Manuscript manuscripts or any consequences arising from the use of any information contained in them. www.rsc.org/dalton ISSN 1477-9226 Dalton TransactionsAn international journal of inorganic chemistry 1477-9226(2010)

show abstract

“…The former values are quite similar to the Pd À N imine distances found in mononuclear diazabutadiene complexes of PdCl 2 (III) [18] or some related pyridylimine complexes IV. [19,20] In contrast, the bonds between Pd and the anionic pyrazolate in 1a and 3a [1.909(5) -1.931(5) ] are significantly shorter than the Pd À N pyridine bonds in type IV systems (in the range 2.02 -2.12 ). However, Pd À Cl distances trans to the pyrazolate-N or pyridine-N are all found in the narrow range 2.26 -2.30 , suggesting a similar trans-influence of the two heterocyclic moieties.…”

Section: Synthesis and Structural Characterisation Of Complexesmentioning

confidence: 99%

Pyrazolate‐Based Dinuclear α‐Diimine‐Type Palladium(II) and Nickel(II) Complexes – a Bimetallic Approach in Olefin Polymerisation

et al. 2006

View full text Add to dashboard Cite

Ni 2 Br 3 ] 3 . Complexes 1a -4a can be described as bimetallic versions of Brookhart-type a-diimine palladium complexes, where dissociation into mononuclear species is prevented by the dinucleating scaffold and the proximate metal ions are suitably positioned to work in concert during substrate transformation. Upon activation of the complexes with MAO and exposure to ethylene, polyethylene is formed. Whereas the palladium complexes display moderate activities, nickel complexes are very active. From structure/activity correlations it is evident that the presence of backbone substitutents at the pyrazolate scaffold as well as bulky ortho aryl substituents is advantageous for polymerisation. Overall, activities of the Ni complexes and the microstructure of the polymer obtained (total branching, T m and molecular weights) are still rather similar to the data reported previously for mononuclear cationic diimine nickel complexes.

show abstract

Pyridinylimine-based nickel(II) and palladium(II) complexes: preparation, structural characterization and use as alkene polymerization catalysts

Cited by 238 publications

References 46 publications

Iminopyridine-Based Cobalt(II) and Nickel(II) Complexes: Synthesis, Characterization, and Their Catalytic Behaviors for 1,3-Butadiene Polymerization

Iminopyridine-Based Cobalt(II) and Nickel(II) Complexes: Synthesis, Characterization, and Their Catalytic Behaviors for 1,3-Butadiene Polymerization

Synthesis and characterization of some water soluble Zn(ii) complexes with (E)-N-(pyridin-2-ylmethylene)arylamines that regulate tumour cell death by interacting with DNA

Pyrazolate‐Based Dinuclear α‐Diimine‐Type Palladium(II) and Nickel(II) Complexes – a Bimetallic Approach in Olefin Polymerisation

Contact Info

Product

Resources

About