| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Gomes, Clara
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (8/8 displayed)
- 2023A Polymorph of Dipeptide Halide Glycyl-L-Alanine Hydroiodide Monohydrate: Crystal Structure, Optical Second Harmonic Generation, Piezoelectricity and Pyroelectricitycitations
- 2023Reversible Single-Crystal-to-Single-Crystal Transformations in a salEen Fe(III) Spin Crossover Spongecitations
- 2019Cu(II) complexes derived from N-carboxymethyl and N-carboxyethyl amino acids as catalysts for asymmetric oxidative coupling of 2-naphtholcitations
- 2018New phenyl-nickel complexes of bulky 2-iminopyrrolyl chelatescitations
- 2015Exploring the influence of steric hindrance and electronic nature of substituents in the supramolecular arrangements of 5-(substituted phenyl)-2-formylpyrrolescitations
- 2014Copper(ii) complexes of bis(aryl-imino)acenaphthene ligandscitations
- 2011New tetradentate N,N,N,N-chelating α-diimine ligands and their corresponding zinc and nickel complexescitations
- 2009Trans-Chlorido(phen-yl)bis-(triphenyl-phosphine)nickel(II) and its 1:1 cocrystal with chloridobis(triphenyl-phosphine)nickel(I)citations
Places of action
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article
New phenyl-nickel complexes of bulky 2-iminopyrrolyl chelates
Abstract
<p>A family of mono(2-iminopyrrolyl) complexes with the general formula [Ni{κ<sup>2</sup>N,N′-5-(aryl)-NC<sub>4</sub>H<sub>2</sub>-2-C(H)═N-2,6-(aryl)}(C<sub>6</sub>H<sub>5</sub>)(PPh<sub>3</sub>)] were obtained from the reaction of the sodium salts of the newly synthesised 5-aryl-2-(N-arylformimino)pyrroles with the square planar complex trans-[Ni(C<sub>6</sub>H<sub>5</sub>)(PPh<sub>3</sub>)<sub>2</sub>Cl]. These new iminopyrrole ligand precursors, designed with increasing bulkiness and different electronic properties, and their corresponding nickel(ii) complexes were characterised by NMR spectroscopy and elemental analysis, and their structural features were analysed by single crystal X-ray diffraction. The nickel complexes were tested as aluminium-free catalysts for the polymerisation of ethylene, at low to moderate pressures and different temperatures and in the absence or presence of the phosphine scavenger [Ni(COD)<sub>2</sub>], giving rise to catalytic activities in the range of 3.61-73.12 kg<sub>PE</sub> mol<sub>Ni</sub><sup>−1</sup> h<sup>−1</sup> bar<sup>−1</sup>. The polyethylene products formed in these catalytic reactions were characterised by GPC/SEC and NMR spectroscopy. Generally, low molecular weight (M<sub>n</sub> 510-1300 g mol<sup>−1</sup>) low viscosity oils were obtained, presenting high branching degrees (80-125 branches per 1000 C atoms), which are characteristic of hyperbranched polyethylene products. In particular, polymerisation reactions using catalyst 7 led to higher viscosity oils with molecular weights between 11 000 and 20 000 g mol<sup>−1</sup>, and branching degrees of 100-120 branches per 1000 C atoms.</p>