Sökning: "Iron - Manganese complexes"

Visar resultat 1 - 5 av 9 avhandlingar innehållade orden Iron - Manganese complexes.

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

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

   Sammanfattning : 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. LÄS MER

3. 2. TCF Bleaching of Softwood Kraft Pulp. Metal Management Procedures

   Författare :Harald Brelid; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; bleaching; manganese; Kraft pulps; iron; copper; hydrogen peroxide; acid pretreatment; calcium; magnesium; liquid chromatography; ion exchange; metal complexes; EDTA;

   Sammanfattning : The aim of this work has been to increase knowledge of the influence of the metal ion content in softwood kraft pulp on peroxide bleaching and to investigate the effects of different metal management procedures at various stages in the production of TCF pulps (i.e. LÄS MER

4. 3. Activation and inhibition of diiron and iron-manganese ribonucleotide reductases

   Författare :Ana Popović-Bijelić; Astrid Gräslund; Anders Hofer; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; class Ic; C. trachomatis; cytotoxicity; KP772; lanthanum; manganese–iron cofactor; metal complex; oligopeptide inhibitor; ribonucleotide reductase; Triapine; tyrosyl radical; Biophysics; biofysik;

   Sammanfattning : Ribonucleotide reductase (RNR) catalyses the reduction of ribonucleotides to deoxyribonucleotides. In conventional class I RNRs the active site is located in the R1 subunit, and the R2 subunit contains a diiron cofactor and a stable tyrosyl radical essential for activity. LÄS MER

5. 4. Structural, Electronic and Reactive Properties of Pentapyridyl - Base Metal Complexes : Relevance for Water Oxidation Catalysis

   Författare :Manuel Boniolo; Johannes Messinger; Antoni Llobet; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Water oxidation; Base metal complexes; Redox potential; Spin crossover; Magnetic anisotropy; Chemistry with specialization in Molecular Biomimetics; Kemi med inriktning mot molekylär biomimetik;

   Sammanfattning : The rationalization of chemical-physical proprieties of transition metal complexes is fundamental in order to understand and tune their reactivity. In this thesis, a systematic investigation of the geometrical and electronic properties of [M(Py5OH)Cl]+ complexes (M= Mn, Fe, Co, Ni) has been performed, and their ability to act as molecular water oxidation catalysts has been probed. LÄS MER

7. 5. Molecular Approaches to Photochemical Solar Energy Conversion : Towards Synthetic Catalysts for Water Oxidation and Proton Reduction

   Författare :Gerriet Eilers; Reiner Lomoth; Leif Hammarström; Wolfgang Lubitz; Uppsala universitet; []
   Nyckelord :Physical chemistry; artificial photosynthesis; solar fuel; WOC; OEC; accumulative electron transfer; hydrogenase mimic; oxygen evolution; proton reduction; water oxidation; Fysikalisk kemi;

   Sammanfattning : A molecular system capable of photoinduced water splitting is an attractive approach to solar energy conversion. This thesis deals with the functional characterization of molecular building blocks for the three principal functions of such a molecular system: Photoinduced accumulative charge separation, catalytic water oxidation, and catalytic proton reduction. LÄS MER