Polymer bulletin, ( ISI ), Volume (74), No (9), Year (2017-9) , Pages (3819-3832)

Title : ( Synthesis and Application Of Fluorinated a- Diimine Nickel Catalyst For Ethylene Polymerization: Deactivation Mechanism )

Authors: S. ahmadjo , سامان دماوندی , Gholamhossein Zohuri , ابالقاسم فرهادی پور , نرجس صمدیه , زهرا اعتمادی نیا ,

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Abstract

Abstract A fluorinated LTM catalyst of [bis(N,N -2-fluorophenylimino)acenaphthene] nickel(II) dibromide was prepared and applied for ethylene polymerization. We established a reasonable hypothesis, highlighting the role of fluorine in ligand structure. In addition, density functional theory (DFT) studies have been applied to strengthen our propositions. DFT calculations of the b-agostic cationic species at room temperature and 75 _C suggest that the b-agostic structure for the latter was destabilized by 19 eV which rendered it less prone to b-H transfer reactions than the species at room temperature. In addition, a mechanism for the catalyst deactivation for fluorinated a-diimine nickel based catalysts has been proposed.

Keywords

, Late transition metal. a, Diimine . Nickel catalyst . DFT . Deactivation mechanism