Novel nickel(II) and copper(II) complexes with phenoxy-imidazole ligands: Syntheses, crystal structures and norbornene addition polymerization

Chen, Feng-Tai; Tang, Guangrong; Jin, Guo‐Xin

doi:10.1016/j.jorganchem.2007.04.010

Cited by 46 publications

(15 citation statements)

References 64 publications

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“…Unlike copper complex Cu[(CH 3 ) 3 CC(NH)CHC(O)C(CH 3 ) 3 ] 2 adopting square planar geometry,35 bulky copper complex 2 can be described as a distorted square planar coordination geometry, which may result from the steric hindrance of the substituents on the imine moieties. The dihedral angle is 38.7° between two coordination planes, which is larger than those of other [N,O]copper(II) complexes 28–31. The bond lengths of Cu(1)O (1.8919(13) Å) and Cu(1)N (1.9700(15) Å) are similar to those of bis(salicylaldiminate)copper(II) complex and other [N,O]copper(II) complexes.…”

Section: Resultsmentioning

confidence: 68%

“…1 H NMR analysis failed because of the paramagnetic character of the Cu(II) complex, which is similar to other copper(II) complexes bearing [N,O] ligands 28–31. Therefore, the IR and elemental analysis were measured to confirm the structures of copper complexes 1 and 2 .…”

Section: Resultsmentioning

confidence: 99%

“…Additionally, the level of alkene incorporation in the copolymers was similar to that reported for well documented radical polymerization systems. Besides, some copper complexes bearing [N,O] liagnds have been developed for norbornene polymerization 27–31. To date, reports on olefin polymerization systems based on copper are scarce, and polymerization mechanism is not clearly deduced.…”

Section: Introductionmentioning

confidence: 99%

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Bis(β‐ketoamino)copper(II)/methylaluminoxane systems for homo‐ and copolymerizations of methyl acrylate and 1‐hexene

Gao

Liu

Pei

et al. 2010

J. Polym. Sci. A Polym. Chem.

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Two bis(b-ketoamino)copper[ArNC(CH 3 )CHC (CH 3 )O] 2 Cu (1, Ar ¼ 2,6-dimethylphenyl; 2, Ar ¼ 2,6-diisopropylphenyl) complexes were synthesized and characterized. Homo-and copolymerizations of methyl acrylate (MA) and 1hexene with bis(b-ketoamino)copper(II) complexes activated with methylaluminoxane (MAO) were investigated in detail. MA was polymerized in high conversion (>72%) to produce the syndio-rich atactic poly(methyl acrylate), but 1-hexene was not polymerized with copper complexes/MAO. Copolymerizations of MA and 1-hexene with 1,2/MAO produced acrylate-enriched copolymers (MA > 80%) with isolated hexenes in the backbone. The calculation of reactivity ratios showed that r(MA) is 8.47 and r(hexene) is near to 0 determined by a Fineman-Ross method. The polymerization mechanism was discussed, and an insertion-triggered radical mechanism was also proposed.

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Section: Resultsmentioning

confidence: 68%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Bis(β‐ketoamino)copper(II)/methylaluminoxane systems for homo‐ and copolymerizations of methyl acrylate and 1‐hexene

Gao

Liu

Pei

et al. 2010

J. Polym. Sci. A Polym. Chem.

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“…This has prompted many chemists to study the norbornene addition polymerization reaction. Up to now, catalytic systems based on titanium,7 zirconium,8 hafnium,9 vanadium,10 cobalt,11 chromium,11a,12 nickel,12b,13 palladium,14 and copper13p,15a–15d complexes have been mainly reported for the addition polymerization of norbornene. Recently, rare‐earth metals were also used in such a reaction, although with a low activity 15e.…”

Section: Introductionmentioning

confidence: 99%

Nickel Complexes and Cobalt Coordination Polymers with Organochalcogen (S, Se) Ligands Bearing an N‐Methylimidazole Moiety: Syntheses, Structures, and Properties

et al. 2008

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Keywords: Chalcogens / Nickel / Cobalt / PolymerizationThe organochalcogen ligands (S, Se) derived from 3-methylimidazole-2-thione/selone groups mbit (2a), mbis (2b), ebit (2c), and ebis (2d) [mbit = 1,1Ј-methylenebis(1,3-dihydro-3-methyl-2H-imidazole-2-thione), mbis = 1,1Ј-methylene-were synthesized and characterized. Mononuclear Ni II complexes NiBr 2 mbit (3a), NiBr 2 mbis (3b), NiBr 2 ebit (3c), and NiBr 2 ebis (3d) were obtained by the reactions of Ni(PPh 3 ) 2 Br 2 with 2a, 2b, 2c, and 2d, respectively. However, when the corresponding ligands 2a, 2b, 2c, and 2d were treated with CoCl 2 in thf solution Co II 1D coordination polymers (CoCl 2 mbit) n (4a), (CoCl 2 mbis) n (4b), (CoCl 2 ebit) n (4c), and (CoCl 2 ebis) n (4d) were obtained. All compounds were fully characterized by IR spectroscopy and elemental analysis. The crystal structures of 2c, 3a, 3b,

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“…Over the past few years, there has been an increasing interest in the use of nickel‐based catalysts for the polymerization of NB 12–31. Nevertheless, the first report on nickel‐based complexes for the polymerization of NB was published back in 1993 by Deming and Novak 32.…”

Section: Introductionmentioning

confidence: 99%

Controlled vinyl‐type polymerization of norbornene with a Nickel(II) diphosphinoamine/methylaluminoxane catalytic system

Vougioukalakis

Stamatopoulos

Petzetakis

et al. 2009

J. Polym. Sci. A Polym. Chem.

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A novel nickel-based complex coordinated with an asymmetric diphosphinoamine ligand was synthesized and fully characterized. Single crystals of good quality were also obtained, and the solid-state structure of the complex was studied via X-rays diffraction. The catalytic activity of this Ni(II) complex in the vinyl-type polymerization of norbornene was studied with methylaluminoxane (MAO) as the cocatalyst/activator. The influence of the reaction time, the equivalents of MAO used, and the concentration of the monomer on: (i) the activity of the catalytic system; (ii) the isolated yield of the polymer; and (iii) the molecular weight and molecular weight distribution of the polymer were investigated. The isolated polynorbornene (PNB) yields are significantly higher compared with those reported for other similar nickelbased systems. The as-obtained PNBs are characterized by high molecular weights and relatively narrow and monomodal molecular weight distributions (amongst the narrowest reported in the literature). The linear dependence of the molecular weight of the obtained PNB on the concentration of norbornene points toward a controlled polymerization reaction.

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Novel nickel(II) and copper(II) complexes with phenoxy-imidazole ligands: Syntheses, crystal structures and norbornene addition polymerization

Cited by 46 publications

References 64 publications

Bis(β‐ketoamino)copper(II)/methylaluminoxane systems for homo‐ and copolymerizations of methyl acrylate and 1‐hexene

Bis(β‐ketoamino)copper(II)/methylaluminoxane systems for homo‐ and copolymerizations of methyl acrylate and 1‐hexene

Nickel Complexes and Cobalt Coordination Polymers with Organochalcogen (S, Se) Ligands Bearing an N‐Methylimidazole Moiety: Syntheses, Structures, and Properties

Controlled vinyl‐type polymerization of norbornene with a Nickel(II) diphosphinoamine/methylaluminoxane catalytic system

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