Polymerization of 1,3-Butadiene with Catalysts Based on Cobalt Dichloride Complexes with Aminophosphines: Switching the Regioselectivity by Varying the MAO/Co Molar Ratio

Giovanni Ricci; Anna Sommazzi; Francesco Masi; Alessandra Forni

doi:10.1007/s10118-023-3060-x

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Polymerization of 1,3-Butadiene with Catalysts Based on Cobalt Dichloride Complexes with Aminophosphines: Switching the Regioselectivity by Varying the MAO/Co Molar Ratio

RESEARCH ARTICLE | Updated：2024-03-14

- Polymerization of 1,3-Butadiene with Catalysts Based on Cobalt Dichloride Complexes with Aminophosphines: Switching the Regioselectivity by Varying the MAO/Co Molar Ratio
- Chinese Journal of Polymer Science Vol. 42, Issue 4, Pages: 501-510(2024)
- Affiliations：
  
  a.CNR-Istituto di Scienze e Tecnologie Molecolari "Giulio Natta" (SCITEC), via A. Corti 12, 20133 Milano, Italy
  b.Scientific Advisor, Viale Giovanni XXIII 34, I- 28100 Novara (NO), Italy
  c.Scientific Advisor, Via Galvani 7, I- 26866 Sant’Angelo Lodigiano (LO), Italy
  d.CNR-Istituto di Scienze e Tecnologie Molecolari "Giulio Natta" (SCITEC), via C. Golgi 19, 20133 Milano, Italy
- Author bio：
  
  giovanni.ricci@scitec.cnr.it
- Funds：
- DOI：10.1007/s10118-023-3060-x
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Ricci, G.; Sommazzi, A.; Masi, F.; Forni, A. Polymerization of 1,3-butadiene with catalysts based on cobalt dichloride complexes with aminophosphines: switching the regioselectivity by varying the MAO/Co molar ratio. Chinese J. Polym. Sci. 2024, 42, 501–510

Giovanni Ricci, Anna Sommazzi, Francesco Masi, et al. Polymerization of 1,3-Butadiene with Catalysts Based on Cobalt Dichloride Complexes with Aminophosphines: Switching the Regioselectivity by Varying the MAO/Co Molar Ratio. [J]. Chinese Journal of Polymer Science 42(4):501-510(2024)
Ricci, G.; Sommazzi, A.; Masi, F.; Forni, A. Polymerization of 1,3-butadiene with catalysts based on cobalt dichloride complexes with aminophosphines: switching the regioselectivity by varying the MAO/Co molar ratio. Chinese J. Polym. Sci. 2024, 42, 501–510 DOI： 10.1007/s10118-023-3060-x.

Giovanni Ricci, Anna Sommazzi, Francesco Masi, et al. Polymerization of 1,3-Butadiene with Catalysts Based on Cobalt Dichloride Complexes with Aminophosphines: Switching the Regioselectivity by Varying the MAO/Co Molar Ratio. [J]. Chinese Journal of Polymer Science 42(4):501-510(2024) DOI： 10.1007/s10118-023-3060-x.

摘要

Some novel cobalt dichloride complexes with amino-phosphine bidentate ligands were synthesized

characterized

and used in combination with methylaluminoxane (MAO) for the polymerization of 1

3-butadiene. Polymers with different structures (i.e.

predominantly 1

2 or

cis

-1

4) were obtained depending on the MAO/Co molar ratio.

Abstract

Several novel cobalt dichloride complexes with amino-phosphine bidentate ligands were synthesized and characterized. For some of them single crystals were obtained and their molecular structure was determined by X-ray diffraction method. All the complexes were then used in combination with MAO for the polymerization of 1

3-butadiene

obtaining polymers with different structures (

i.e.

predominantly 1

2 or

cis

-1

4) mainly depending on the type of ligand and on the MAO/Co molar ratio. The behavior of these novel catalysts was compared with that exhibited

in the polymerization of the same monomer

by the systems CoCl

(PR

)

-MAO and CoCl

(PRPh

)

-MAO (R = alkyl or cycloalkyl group)

and by the systems based on cobalt dichloride complexes with various bi- and tridentate ligands (

e.g.

diphosphines

bis-imines

pyridyl-imines

bis-iminopyridines). The comparison between the different systems allowed us to make some clarity about the actual and effective role played by the various types of ligands in the polymerization of conjugated dienes with catalytic systems CoCl

(L)-MAO

in which L = mono-

bi-

or tri-dentate ligand.

关键词

Keywords

13-ButadieneStereospecific polymerizationCobalt catalystsRegioselectivityAminophosphine ligandsCrystal structuresChelate rings

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