<> "The repository administrator has not yet configured an RDF license."^^ . <> . . "Mikroporöse organische Polymere auf Basis tetraedrischer Monomere der Gruppe IV"^^ . "In this thesis, porous organic polymers were synthesized on the basis of tetrahedral monomers of\r\nthe group IV. Their optical properties and porosities were investigated and specifically tuned by\r\nthe choice of monomers, reaction conditions or by postmodification.\r\nFirst, a tetrahedral, silicon-centered monomer with terminal bromides was employed for the\r\nYamamoto homocoupling (Scheme 1, left). The alkyne functionalities at the central atom allow for\r\nthe cleavage of the silicon-carbon-bond, after which the organic fragments of the insoluble\r\nnetwork were identified. The results were compared to a formally structural identical material\r\nthat was synthesized via an alternative synthesis route. Furthermore, tetrakis(4-ethynylphenyl)stannane was employed in a screening under Sonogashira-\r\nHagihara conditions (Scheme 1, right). Fluorescence and porosity of the formally identical\r\nnetworks were dependent on the chosen reaction conditions. The materials were cleaved at the\r\ntin-carbon bonds with chloroacetic acid to analyze the organic linkers and examine the\r\ncompleteness of the polymerization.\r\nIn addition, networks were screened for the influence of the central atom in the tetrahedral\r\nmonomer. The elements of group IV (M = C, Si, Ge, Sn) were used as central units. Irrespectively\r\nof the applied conditions, the carbon-centered materials revealed the highest BET surface areas\r\nwhereas the tin-centered ones yielded the lowest. Nevertheless, the absolute dimension of the\r\nsurface area is related to the chosen synthesis protocol.\r\nMoreover, postmodification of porous polymers derived from AA’-polymerization of varying\r\namounts of silicon- and tin-centered monomers was realized. They were selectively cleaved at the\r\ntin-carbon bonds to release fractions of the linkers and to tune porosity and emission color.\r\nFinally, sulfur containing polymers were synthesized from tetrakis(4-ethynylphenyl)silane for\r\nimplementation as cathode material in lithium sulfur batteries. The networks showed moderate\r\nactivities with capacities up to 750 mAh/g."^^ . "2018" . . . . . . . "Andrea Christina"^^ . "Uptmoor"^^ . "Andrea Christina Uptmoor"^^ . . . . . . "Mikroporöse organische Polymere auf Basis tetraedrischer Monomere der Gruppe IV (Other)"^^ . . . . . . "indexcodes.txt"^^ . . . "Mikroporöse organische Polymere auf Basis tetraedrischer Monomere der Gruppe IV (Other)"^^ . . . . . . "lightbox.jpg"^^ . . . "Mikroporöse organische Polymere auf Basis tetraedrischer Monomere der Gruppe IV (Other)"^^ . . . . . . "preview.jpg"^^ . . . "Mikroporöse organische Polymere auf Basis tetraedrischer Monomere der Gruppe IV (Other)"^^ . . . . . . "medium.jpg"^^ . . . "Mikroporöse organische Polymere auf Basis tetraedrischer Monomere der Gruppe IV (Other)"^^ . . . . . . "small.jpg"^^ . . . "Mikroporöse organische Polymere auf Basis tetraedrischer Monomere der Gruppe IV (PDF)"^^ . . . "DissertationAndrea.pdf"^^ . . "HTML Summary of #25122 \n\nMikroporöse organische Polymere auf Basis tetraedrischer Monomere der Gruppe IV\n\n" . "text/html" . . . "540 Chemie"@de . "540 Chemistry and allied sciences"@en . .