Key Interactions in Heterogeneous Ziegler-Natta Catalytic Systems: Structure and Energetic of TiCl4-Lewis Base Complexes
| Autor: | Andrea Melchior, Giampiero Morini, Marilena Tolazzi, Silvia Del Piero, Fabrizio Piemontesi, Rosalisa Fedele, Jean-Marie Ducere, Luigi Cavallo |
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| Jazyk: | angličtina |
| Rok vydání: | 2007 |
| Předmět: |
Steric effects
Diethyl succinate Diethyl phthalate Ethyl benzoate Dimethoxyethane Surfaces Coatings and Films Electronic Optical and Magnetic Materials Solvent chemistry.chemical_compound General Energy chemistry Polymer chemistry Organic chemistry Lewis acids and bases Physical and Theoretical Chemistry Tetrahydrofuran |
| Popis: | Extensive calorimetric investigations on the interaction of TiCl4 with some Lewis bases are presented. Some of the bases were chosen for their industrial relevance in heterogeneous Ziegler−Natta polymerization of propene (ethyl benzoate, L2, diisobutyl phthalate, L3, (2R,3S)-diethyl 2,3-diisopropylsuccinate, L6, (2S,3S)-diethyl 2,3-diisopropylsuccinate, L7, and 9,9-bis(methoxymethyl)-9H-fluorene, L13) while other bases were chosen as probe molecules to explore the electronic and steric effects on the complexation energy (ethyl acetate, L1, diethyl phthalate, L4, diethyl succinate, L5, tetrahydrofuran, L8, dimethoxyethane, L9, dimethoxypropane, L10, dimethoxybutane, L11, and 3,3-bis(methoxymethyl)-2,6-dimethylheptane, L12). 1,1,2,2,-Tetrachloroethane was selected as the solvent for its low donating properties, which allows the focus to be on the metal−donor interaction. The calorimetric data are discussed and compared with the efficiency of the derived catalysts. Further understanding is obtained by compar... |
| Databáze: | OpenAIRE |
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