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Showing result 1 - 5 of 18 swedish dissertations matching the above criteria.

2. 1. Novel Approaches to Phosphorus-containing Heterocycles and Cumulenes

   Author : Anna Arkhypchuk; Sascha Ott; John D. Protasiewicz; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; phosphorus; phosphole; oxaphosphole; cumulene; phospha-Wittig-Horner reagent; molecular electronics; Chemistry; Kemi;

   Abstract : Fast development in all areas of life and science over the last 50 years demands versatile, energy efficient and cheap materials with specific but easily tuneable properties which can be used for example in organic light emitting diodes (OLEDs), thin-film transistors, photovoltaic cells, etc. This thesis is devoted to the development of novel synthetic approaches to molecules with potential applications in the field of molecular electronics. READ MORE

4. 2. Novel electrode and photoelectrode materials for hydrogen production based on molecular catalysts

   Author : Andrew J. Bagnall; Leif Hammarström; Vincent Artero; Sascha Ott; Alexander Cowan; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; electrochemical mechanism; hydrogen; artificial photosynthesis; molecular catalyst; hydrogen evolution; cobalt; Kemi; Chemistry;

   Abstract : The PhD project focussed on the application of a cobalt tetraazamacrocyclic complex, in the literature commonly referred to as [Co(CR)Cl2]+ as a molecular catalyst for the hydrogen evolution reaction (HER). This was within the broader scope of the EU MSCA H2020 ITN ‘eSCALED’ project, which primarily aimed to create artificial leaf devices for the storage of solar energy in chemical fuels and, as part of this, sought the development of novel bio-inspired and scalable materials. READ MORE

5. 3. Iron, Manganese and Iridium Complexes From Models of RNR and Catalase to Water Oxidation

   Author : Michele Bedin; Anders Dr. Thapper; Sascha Prof. Ott; Vadim G. Kessler; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Iron; manganese; MnCAT; RNR; biomimetic; Kemi; Chemistry;

   Abstract : The focus of this thesis has been synthesise and study metal complexes that mimic the structure and function of the active site in two particular metalloenzymes, ribonucleotide reductase (RNR) and manganese catalase (MnCAT). These two metalloenzymes both have two transition metals ions in the cofactor: two manganese ions in MnCAT and either two iron, iron-manganese or two manganese ions in RNR. READ MORE

6. 4. From Peak to Peak: Exploring Electron Hopping and Mass Transport in Metal-Organic Frameworks

   Author : Ashleigh T. Castner; Sascha Ott; Deanna M. D'Alessandro; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; charge transport; mass transport; metal-organic frameworks; electrocatalytic materials; electrochemistry; Kemi; Chemistry;

   Abstract : Incorporating molecular electrocatalysts into solid support structures combines the best of two worlds: their molecular nature allows precise structural tunability for selective and efficient conversion of small molecule substrates, while their structural integrity is greatly improved by the heterogeneous support matrix to allow for long-term stability and potentially industrial-scale applications. Metal-organic frameworks (MOFs) represent a potential class of materials to act as viable support scaffolds for hosting molecular catalysts for sustainable energy conversion, exhibiting well-ordered porous structures that can support high loading densities of catalyst species. READ MORE

7. 5. Olefins from carbonyls : Development of new phosphorus-based cross-coupling reactions

   Author : Nicolas Daniele D'Imperio; Sascha Ott; Carlos Romero-Nieto; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; olefins; carbonyl olefination; phosphaalkenes; stereoselective synthesis; Wittig; Horner-Wadsworth-Emmons; McMurry;

   Abstract : Olefins, compounds containing C=C double bonds, are omnipresent in nature and serve as useful starting materials for various chemical modifications. Olefins are of crucial importance in Medicinal Chemistry and are also present in essential objects like dyes, polymers and plastics. READ MORE