title: Mikroporöse organische Polymere auf Basis tetraedrischer Monomere der Gruppe IV
creator: Uptmoor, Andrea Christina
subject: ddc-540
subject: 540 Chemistry and allied sciences
description: In this thesis, porous organic polymers were synthesized on the basis of tetrahedral monomers of  the group IV. Their optical properties and porosities were investigated and specifically tuned by  the choice of monomers, reaction conditions or by postmodification.  First, a tetrahedral, silicon-centered monomer with terminal bromides was employed for the  Yamamoto homocoupling (Scheme 1, left). The alkyne functionalities at the central atom allow for  the cleavage of the silicon-carbon-bond, after which the organic fragments of the insoluble  network were identified. The results were compared to a formally structural identical material  that was synthesized via an alternative synthesis route. Furthermore, tetrakis(4-ethynylphenyl)stannane was employed in a screening under Sonogashira-  Hagihara conditions (Scheme 1, right). Fluorescence and porosity of the formally identical  networks were dependent on the chosen reaction conditions. The materials were cleaved at the  tin-carbon bonds with chloroacetic acid to analyze the organic linkers and examine the  completeness of the polymerization.  In addition, networks were screened for the influence of the central atom in the tetrahedral  monomer. The elements of group IV (M = C, Si, Ge, Sn) were used as central units. Irrespectively  of the applied conditions, the carbon-centered materials revealed the highest BET surface areas  whereas the tin-centered ones yielded the lowest. Nevertheless, the absolute dimension of the  surface area is related to the chosen synthesis protocol.  Moreover, postmodification of porous polymers derived from AA’-polymerization of varying  amounts of silicon- and tin-centered monomers was realized. They were selectively cleaved at the  tin-carbon bonds to release fractions of the linkers and to tune porosity and emission color.  Finally, sulfur containing polymers were synthesized from tetrakis(4-ethynylphenyl)silane for  implementation as cathode material in lithium sulfur batteries. The networks showed moderate  activities with capacities up to 750 mAh/g.
date: 2018
type: Dissertation
type: info:eu-repo/semantics/doctoralThesis
type: NonPeerReviewed
format: application/pdf
identifier: https://archiv.ub.uni-heidelberg.de/volltextserverhttps://archiv.ub.uni-heidelberg.de/volltextserver/25122/1/DissertationAndrea.pdf
identifier: DOI:10.11588/heidok.00025122
identifier: urn:nbn:de:bsz:16-heidok-251227
identifier:   Uptmoor, Andrea Christina  (2018) Mikroporöse organische Polymere auf Basis tetraedrischer Monomere der Gruppe IV.  [Dissertation]     
relation: https://archiv.ub.uni-heidelberg.de/volltextserver/25122/
rights: info:eu-repo/semantics/openAccess
rights: http://archiv.ub.uni-heidelberg.de/volltextserver/help/license_urhg.html
language: ger