Syntheses and Ethylene Polymerization Behavior of Supported Salicylaldimine-Based Neutral Nickel(II) Catalysts

Citations Over TimeTop 24% of 2007 papers

Abstract

Two novel salicylaldimine-based neutral nickel(II) complexes, [(2,6-iPr2C6H3)NCH(2-ArC6H3O)]Ni(PPh3)Ph (6, Ar = 2-(OH)C6H4; 8, Ar = 2-OH-3-(2,6-iPr2C6H3NCH)C6H3), have been synthesized, and their structures have also been confirmed by X-ray crystallography, elemental analysis, and 1H and 13C NMR spectra. An important structural feature of the two complexes is the free hydroxyl group, which allows them to react with silica pretreated with trimethylaluminum under immobilization by the formation of a covalent bond between the neutral nickel(II) complex and the pretreated silica. As active single-component catalysts, the two complexes exhibited high catalytic activities up to 1.14 and 1.47 × 106 g PE/molNi·h for ethylene polymerization, respectively, and yielded branched polymers. Requiring no cocatalyst, the two supported catalysts also showed relatively high activities up to 4.0 × 105 g PE/molNi·h and produced polyethylenes with high weight-average molecular weights of up to 120 kg/mol and a moderate degree of branching (ca. 13−26 branches per 1000 carbon atoms).

Related Papers

• → An efficacious synthesis of N‐1–, C‐3–substituted indole derivatives and their antimicrobial studies(2019)20 cited
• → Determination of low degrees of long-chain branching in polybutadiene by double-bond hydrogenation followed by 13C NMR and DEPT spectroscopies(2019)4 cited
• → Preliminary analysis of the 1H-NMR and 13C-NMR spectra poly(2-vinyl-5-methyl furan)(1995)1 cited
• Synthesis and NMR Analysis on Intermediate of Polyfluorene Derivative(2012)
• → Δομικές μελέτες ενώσεων βιολογικού ενδιαφέροντος με τη συνδυαστική χρήση NMR και θεωρητικών υπολογισμών(2023)