TY - JOUR A1 - Sanchez-Naya, Roberto A1 - Stepanenko, Vladimir A1 - Mandel, Karl A1 - Beuerle, Florian T1 - Modulation of Crystallinity and Optical Properties in Composite Materials Combining Iron Oxide Nanoparticles and Dye-Containing Covalent Organic Frameworks JF - Organic Materials N2 - Two series of organic–inorganic composite materials were synthesized through solvothermal imine condensation between diketopyrrolopyrrole dialdehyde DPP-1 and 5,10,15,20-tetrakis(4-aminophenyl)porphyrin (TAPP) in the presence of varying amounts of either amino- or carboxy-functionalized superparamagnetic iron oxide nanoparticles (FeO). Whereas high FeO loading induced cross-linking of the inorganic nanoparticles by amorphous imine polymers, a lower FeO content resulted in the formation of crystalline covalent organic framework domains. All hybrid materials were analyzed by magnetization measurements, powder X-ray diffraction, electron microscopy, IR, and UV/Vis absorption spectroscopy. Crystallinity, chromophore stacking, and visible absorption features are directly correlated to the mass fraction of the components, thus allowing for a fine-tuning of materials properties. KW - covalent organic frameworks KW - diketopyrrolopyrroles KW - porphyrins KW - iron oxide nanoparticles KW - hybrid materials KW - superparamagnetism Y1 - 2021 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-231480 VL - 3 ER - TY - THES A1 - Sánchez Naya, Roberto T1 - Synthesis and Characterization of Dye-Containing Covalent Organic Frameworks T1 - Synthese und Charakterisierung von farbstoffhaltigen kovalenten organischen Netzwerken N2 - The present thesis adress the synthesis and characterization of novel COFs that contain dye molecules as integral components of the organic backbone. These chromophore-containing frameworks open new research lines in the field and call for the exploration of applications such as catalysis, sensing, or in optoelectronic devices. Initially, the fabrication of organic-inorganic composites by the growth of DPP TAPP COF around functionalized iron oxide nanoparticles is reported. By varying the ratio between inorganic nanoparticles and organic COFs, optoelectronic properties of the materials are adjusted. The document also reports the synthesis of a novel boron dipyrromethene-containing (BODIPY) COF. Synthesis, full characterization and the scope of potential applications with a focus on environmental remediation are discussed in detail. Last, a novel diketopyrrolopyrrole-containing (DPP) DPP-Py-COF based on the combination of DDP and pyrene building blocks is presented. The very low bandgap of these materials and initial investigations on the photosensitizing properties are discussed. N2 - Die Forschung an modernen porösen Materialien hat die Entwicklung von COFs als robuste, leichtgewichtige, hochgeordnete und vielseitig einsetzbare organische Materialien vorangetrieben. Der Einsatz von DCC ist entscheidend für den Aufbau hochkristalliner Netzwerke, die in der Lage sind, strukturelle Defekte selbst zu heilen (Kapitel 2.2). Für die einfache Bildung wohldefinierter Kristallite wurden verschiedene synthetische Strategien entwickelt (Kapitel 2.3). Darüber hinaus ist ein detailliertes Verständnis über die verschiedenen Reaktionen, die für die kovalente Verknüpfung organischer Bausteine eingesetzt werden (Kapitel 2.4), und der verschiedenen Topologien, die sich nach der Vernetzung ergeben (Kapitel 2.5), von grundlegender Bedeutung für die Entwicklung einer breiten Auswahl von Materialien für gezielte Anwendungen. ... KW - Organische Chemie KW - Porosität KW - Covalent Organic Framework KW - Reticular Chemistry KW - Dye KW - Porous Materials Y1 - 2023 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-288996 ER -