Unsymmetric PCN Pincer Palladium and Nickel Complexes: Synthesis, Characterization and Reactivity

Forskningsoutput: AvhandlingDoktorsavhandling (sammanläggning)

Abstract

Using transition metals in organic synthesis has led to the discovery of new reactions. These novel reactions have enabled different valuable transformations to take place through short synthetic routes and most importantly using a small amount of the metal. This small amount is called a catalytic amount and the metal which is in the form of a complex (with an array of groups of atoms bonded to the metal, so called ligands) is then known as a catalyst. Transition metal complexes have been extensively employed as catalysts to mediate many transformations. These transformations provide our society with useful things, e.g. pharmaceuticals to treat diseases for example cancer, killing a lot of people around the world, clean fuels to protect our planet from pollution and solar cells to provide a clean source of energy. All these useful things start in a small scale at laboratories in universities and companies and are then applied on a large scale in industry.
In general, an organometallic catalyst can be divided into two parts, the metal center and the surrounding inorganic or organic molecule or atom, the ligand. The ligand is responsible for tuning the electronic and steric properties of the catalyst. Changing the donor atoms of the ligand scaffolds greatly influences the catalytic activity. Different types of ligands have been used in combination with a variety of transition metals in order to prepare new catalysts. Palladium and nickel have gained a lot of interest in this respect. Also, monodentate and bidentate ligands (with one and two binding atoms, respectively) have been extensively employed with these metals because most of them are commercially available and easily accessible. However, these ligands do not always give stable complexes, which result in decomposition affecting the outcome of the catalytic process. This problem induced chemists to develop new type of ligands having a more robust interaction with the metal in a tridentate fashion (with three binding atoms). Indeed, complexes supported by tridentate ligands displayed unique reactivities compared to those including other ligands.
In the current thesis, we have designed and synthesized new palladium and nickel complexes containing tridentate PCN ligands (with phosphorus, carbon and nitrogen binding to the metal). Our choice of palladium and nickel is in line with their successful and great applications in catalysis. We used the new complexes in the activation of CO2 and formation of new molecules, which are relevant to pharmaceuticals. Using different donor atoms were found to be very important to enhance the catalytic activities of these complexes.

Detaljer

Författare
Enheter & grupper
Forskningsområden

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Oorganisk kemi

Nyckelord

Originalspråkengelska
KvalifikationDoktor
Tilldelande institution
Handledare/Biträdande handledare
Tilldelningsdatum2018 dec 17
UtgivningsortLund
Förlag
  • Kemiska institutionen, Lunds universitet
Tryckta ISBN978-91-7422-608-9
Elektroniska ISBN978-91-7422-609-6
StatusPublished - 2018 nov
PublikationskategoriForskning

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