Avviso di Seminario: Pedro T. Gomes - “Tuning 2-Iminopyrrolyl Ligands to be used in Metal Complexes for Polymerisation Catalysis and Luminescent Materials", Aula A1, Edificio C11 (terzo piano)

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Data evento
Data inizio evento: 
24/05/2016 - 16:15
Data fine evento: 
24/05/2016 - 17:15
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Prof. Pedro T. Gomes

(Instituto Superior Técnico, Centro de Química Estrutural, University of Lisboa)
mail: pedro.t.gomes@tecnico.ulisboa.pt


Tuning 2-Iminopyrrolyl Ligands to be used in Metal Complexes for Polymerisation Catalysis and Luminescent Materials



There has been a continuous interest in well-defined aluminium-free homogeneous olefin polymerisation catalysts based on late-transition-metal complexes. The homo- and copolymerisation of ethylene using neutral nickel(II) complexes bearing monoanionic bidentate ligands led to important progresses in this field. In view of this interest, we have developed a ligand framework based on 2-(N-arylimino)pyrrolyl ligands. This type of N,N’-bidentate ligands has a neutral imine donor and an anionic nitrogen pyrrolyl moiety leading to five-membered metal chelates. The first part of the seminar presents the routes employed in the organic synthesis of the ligand precursors, whereby electronic and steric modifications are introduced, which are then used in the preparation of a new family of nickel(II) complexes bearing 5-substituted-2-iminopyrrolyl based scaffolds. The testing of these new nickel(II) complexes in the aluminium-free polymerisation of ethylene is discussed.

Ligands of the same family can also be coordinated to boron(III) centres. In a second part of the seminar, several aspects of the synthesis, molecular structure, and photophysical characterisation of a new family of highly photoluminescent tetracoordinate boron complexes bearing 2-iminopyrrolyl ligands will be presented. These bidentate ligands can be fine-tuned either electronically or sterically, leading to different emission colours. Diverse strategies used for the tuning of these compounds will be discussed. Some features of the application of these complexes in electroluminescent layers of Organic Light Emitting Diode (OLED) devices will also be described.




Ultimo aggiornamento: 18-05-2016 - 13:30