Search for dissertations about: "Dithienothiophene"

Found 3 swedish dissertations containing the word Dithienothiophene.

  1. 1. Synthesis of new building blocks for conjugated oligomers

    Author : Fredrik Allared; KTH; []
    Keywords : organic semiconductors; thiophenes; heterocyclic synthesis; dithienothiophene; naphthalene;

    Abstract : This thesis deals with the synthesis of new organicmaterials for electronic applications. Several new ring-formingmethods are employed to construct sulphur heterocycles: Tandemelectrophilic aromatic substitution and acid-catalyzedtransetherification of methoxythiophene, double electrophilicaromatic substitutions with ethane-1, 2-disulphenyl chloride,and also, the reaction of dienes with sulphur dichloride. READ MORE

  2. 2. Synthesis of extended thiophene systems : materials for electronical and optical applications

    Author : Tommi Remonen; KTH; []
    Keywords : ;

    Abstract : In this thesis the synthesis and some material properties ofdifferent extended thiophene systems have been studied. One ofthe areas studied is the synthesis of methyl- and methylthiosubstituted dithienothiophene donors and their abilities toform cation radieal- and charge transfer salts. READ MORE

  3. 3. Quantum chemical calculations of non-linear optical absorption

    Author : Peter Cronstrand; KTH; []
    Keywords : quantum chemical; non-linear optical; multi-photon absorption;

    Abstract : This thesis represents a quantum chemical treatise ofvarious types of interactions between radiation and molecularsystems, with special emphasis on the nonlinear opticalprocesses of Multi-Photon Absorption and Excited StateAbsorption. Excitation energies, transition dipole moments,two-photon and three-photon tensor elements have beencalculated from different approaches; density functional theoryandab-initiotheory, employing different orders ofcorrelation treatment with the purpose to provide accuratevalues as well as evaluate the quality of the lower ordermethods. READ MORE