Sökning: "Charge-separated state"

Visar resultat 6 - 10 av 21 avhandlingar innehållade orden Charge-separated state.

  1. 6. Structure-Function Relationships in RuII Complexes with Unconventional Ligands: Photophysical and Photochemical Studies

    Författare :Joachim Wallenstein; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; structure-function relationship; spectral component analysis; photochemistry; RuII complexes; photoreaction; hole-transfer;

    Sammanfattning : The rich photophysics, photochemistry and electrochemistry of RuII complexes have attracted intense research interest in widely disparate fields. A large portion of the studied and applied complexes are derived from the archetypical [Ru(bpy)3]2+ (bpy is 2,2’-bipyridine), which absorbs in the visible region, displays a long lived (~1 μs), emissive metal-to-ligand charge transfer state, and shows reversible electrochemistry in both the ground and excited state. LÄS MER

  3. 7. Single and Accumulative Electron Transfer – Prerequisites for Artificial Photosynthesis

    Författare :Susanne Karlsson; Leif Hammarström; Hans-Christian Becker; Devens Gust; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Artificial photosynthesis; Photoinduced charge separation; Electron transfer; Energy transfer; Accumulative electon transfer; Donor-acceptor; Ruthenium; Linear arrays; Chemical physics; Kemisk fysik; Kemi med inriktning mot kemisk fysik; Chemistry with specialization in Chemical Physics;

    Sammanfattning : Photoinduced electron transfer is involved in a number of photochemical and photobiological processes. One example of this is photosynthesis, where the absorption of sunlight leads to the formation of charge-separated states by electron transfer. LÄS MER

  4. 8. Dinuclear Manganese Complexes for Artificial Photosynthesis : Synthesis and Properties

    Författare :Magnus Anderlund; Björn Åkermark; William H. Armstrong; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Crystal Structure; Artificial photosynthesis; Manganese complex; Organic chemistry; Organisk kemi;

    Sammanfattning : This thesis deals with the synthesis and characterisation of a series of dinuclear manganese complexes. Their ability to donate electrons to photo-generated ruthenium(III) has been investigated in flash photolysis experiments followed by EPR-spectroscopy. LÄS MER

  5. 9. Singlet Fission - The Effects of Solvent Polarity and Conformation

    Författare :Rasmus Ringström; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Singlet fission; rotational conformation; photoinduced electron transfer; transient absorption;

    Sammanfattning : Singlet fission (SF) is a process in which one initial high energy singlet excited state is converted into two triplet excited states of roughly half the energy of the initial state. This process has the potential to increase the efficiency of conventional solar cells by modifying the energy of the incident solar radiation to better match the energy input required to generate electricity. LÄS MER

  7. 10. A Tale of Chaos and Colour Influencing the photophysical properties and glass forming abilities of BODIPY dyes via structural modification

    Författare :Clara Schäfer; Göteborgs universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; BODIPYs; structure-to-optical properties relationship; entropy; amorphous materials; exciton coupling;

    Sammanfattning : Organic dyes are everyday contributors in chemistry, physics and biology. BODIPY dyes were used as model dye class in this thesis. They are well-known for their versatility, which mainly originates from the tuneability of their photophysical properties upon changes in their molecular structure. LÄS MER