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- Übergangsmetall-Komplexe (1)
- Übergangsmetallborylen, Borylentransfer, Basenstabilisiertes Borylen, Metathese (1)
- Übergangsmetallchloride (1)
- Übergangsmetalle (1)
- Übergangsmetallorganische Verbindungen (1)
- α-aminoboronates (1)
- π aromaticity (1)
- π-Aromatizität (1)
- π-extension (1)
Institute
- Institut für Anorganische Chemie (671) (remove)
Sonstige beteiligte Institutionen
- Didaktik der Chemie (1)
- Fakultät für Chemie und chemische Biologie, Technische Universität Dortmund (1)
- Fraunhofer Insitut für Silicatforschung ISC (1)
- Fraunhofer-Institut Würzburg (1)
- Fraunhofer-Institut für Chemische Technologie (ICT) (1)
- Institut Ruđer Bošković, Zagreb, Croatia (1)
- Institut für Organische Chemie, RWTH Aachen (1)
- Institute for Sustainable Chemistry & Catalysis with Boron (1)
- Institute of Transformative Bio-Molecules, Nagoya University, Nagoya, Japan (1)
- Leibniz-Institut für Katalyse Rostock (1)
ResearcherID
- D-3057-2014 (1)
π-Conjugated organic polymers have attracted tremendous attention in the last decades, and the interest in these materials is mainly driven by their applicability in next-generation electronic and optoelectronic devices (OLEDs, OFETs, photovoltaics). The partial or complete replacement of carbon atoms by main group elements in conjugated polymers can significantly change the characteristics and applications of these macromolecules. In this work, a class of inorganic polymers comprising a backbone of exclusively boron and nitrogen atoms (poly(iminoborane)s, PIBs) and their monodisperse oligomers is described. In addition, novel inorganic–organic hybrid polymers containing BN units in their polymer backbone were synthesized and characterized.
In chapter 2.1, the development of catalytic B–N coupling routes for the controlled synthesis of macromolecular materials is described. While the reaction of an N-silyl-B-chloro-aminoborane with the electrophilic reagent trimethylsilyl triflate led to effective B–N coupling, the reaction with a silver(I) salt resulted in an intramolecular Cl/Me exchange between the boron and silicon centers.
In chapter 2.2-2.4, the study of oligo- and poly(iminoborane)s is discussed. Monodisperse and cyclolinear oligo(iminoborane)s based on diazaborolidines with up to 7 boron and 8 nitrogen atoms were synthesized by successively extending the B-N main chain. However, the use of benzodiazaborolines only led to limited BN catenation. Furthermore, the redistribution processes resulting from the reaction of longer oligomers with non-stoichiometric amounts of (di)halogenated boranes is reported.
In chapter 2.5-2.6, the synthesis of 1,2,5-azadiborolanes as building blocks for the synthesis of poly(iminoborane)s and inorganic-organic hybrid polymers is described. While the attempt to apply an azadiborolane with sterically demanding groups on the boron-bridging ethylene unit for the construction of PIB was unfeasible, it was successfully incorporated in inorganic-organic hybrid polymers. Photophysical studies indicated π-conjugation along the polymer chain. A first attempt to synthesize PIBs based on azadiborolanes with unsubstituted ethylene units showed promising results.
In chapter 2.7-2.8, a comprehensive study of poly(arylene iminoborane)s, which are BN analogs of poly(arylene vinylene)s is described, and the properties of four polymers as well as twelve monodisperse oligomers were investigated. Photophysical investigations of the monomers, dimers and polymers showed a systematic bathochromic shift of the absorption maximum with increasing chain length and thiophene content. Based on TD-DFT calculations of the model oligomers, the lowest-energy absorption band could be assigned to HOMO to LUMO transitions with π-π* character. The oligo- and poly(arylene iminoborane)s showed only very weak to no emission in solution but they were emissive in the solid state. For four oligomers the aggregation induced emission (AIE) in a THF/water mixture was investigated and DLS studies confirmed the formation of nanoaggregates.
In chapter 2.9, oligo- and polymerizations of sulfur-containing building blocks and subsequent pH-triggered degradation of the products is described. While a sulfilimine-containing oligomer could not be isolated, the sulfone-, sulfoximine-, and sulfoxide-containing molecular oligomers and polymers could be successfully synthesized by B=N or B–O bond formation reactions. The sulfur-containing building blocks were successfully released under acidic or basic conditions, which was confirmed by NMR spectroscopy and mass spectrometry.
A series of tetracationic bis-triarylborane dyes, differing in the aromatic linker connecting two dicationic triarylborane moieties, showed very high submicromolar affinities toward ds-DNA and ds-RNA. The linker strongly influenced the emissive properties of triarylborane cations and controlled the fluorimetric response of dyes. The fluorene-analog shows the most selective fluorescence response between AT-DNA, GC-DNA, and AU-RNA, the pyrene-analog’s emission is non-selectively enhanced by all DNA/RNA, and the dithienyl-diketopyrrolopyrrole analog’s emission is strongly quenched upon DNA/RNA binding. The emission properties of the biphenyl-analog were not applicable, but the compound showed specific induced circular dichroism (ICD) signals only for AT-sequence-containing ds-DNAs, whereas the pyrene-analog ICD signals were specific for AT-DNA with respect to GC-DNA, and also recognized AU-RNA by giving a different ICD pattern from that observed upon interaction with AT-DNA. The fluorene- and dithienyl-diketopyrrolopyrrole analogs were ICD-signal silent. Thus, fine-tuning of the aromatic linker properties connecting two triarylborane dications can be used for the dual sensing (fluorimetric and CD) of various ds-DNA/RNA secondary structures, depending on the steric properties of the DNA/RNA grooves.
Im Fokus der Dissertation stand die Synthese von Vorstufen (Imidazoliumsalze) für NHC-Liganden sowie die Umsetzung dieser Verbindungen zu N-heterocyclischen Carbenen unter Verwendung des Carba-closo-dodecaborat-Anions. Hierbei wurde der Cluster über die Position B12 oder B7 an das Stickstoffatome des Imidazols gebunden. Zur Synthese wurden unterschiedliche Routen ausgehend von \(Cs[12-I-closo-1-CB_{11}H_{11}]\) und \(12-PhI-closo-1-CB_{11}H_{11}\) sowie den entsprechenden 7-Isomeren untersucht und miteinander verglichen. Die isomerenreinen Synthesen wurden hinsichtlich ihrer Vor- und Nachteile untersucht und so optimiert. Es wurden sowohl unsymmetrische Imidazoliumsalze mit dem Carba-closo-dodecaborat-Anion auf der einen Seite und Alkyl- oder Arylreste (Butyl, Methyl, Phenyl, p-Methoxyphenyl, p-Fluorphenyl-, Vinyl-, Benzyl- und Mesitylsubstituenten) als auch die symmetrische Variante mit zwei Carboranylcluster synthetisiert. Besonders hervorzuheben ist hierbei, dass die Synthese des Bis(1,3-Carboran-12-yl)imidazolatanions in einer Buchwald-Hartwig-Kreuzkupplungsreaktion durch Umsetzung der Reagenzien \(Cs[12-I-closo-1-CB_{11}H_{11}]\) und \(Cs[12-Imidazolyl-closo-1-CB_{11}H_{11}]\) durch 1 zu 1 Umsetzung miteinander reagiert haben. In den meisten bisher literaturbekannten und im Rahmen der Doktorarbeit untersuchten Buchwald-Hartwig-Kreuzkupplungsreaktionen sind 4-14 Äquivalente des Amins notwendig. Darüberhinaus erfordert das Amin häufig eine Aktivierung durch Umsetzung zu Lithiumorganylen. Dies war bei der Umsetzung von \(Cs[12-I-closo-1-CB_{11}H_{11}]\) mit \(Cs[12-Imidazolyl-closo-1-CB_{11}H_{11}] \) nicht notwendig und zeigt den starken elektronenschiebenden Effekt des Clusters auf. Die unsymmetrischen Imidazoliumsalze konnten durch Umsetzung mit n-Butyllithium zu C2-NHC-Derivate umgesetzt werden. Bei der Umsetzung des Bis(1,3-Carboran-12-yl)imidazolatanions bildete sich zunächst ein Gemisch aus dem C2- und C5-Isomer, des Weiteren ist anteilig auch die Deprotonierung am Clusterkohlenstoffatom aufgetreten.
Die vorliegende Arbeit beschäftig sich mit der Synthese und Reaktivität von Phosphan-stabilisierten Diborenen, die auf Grund ihres Substitutionsmusters über ein erhöhtes Reaktivitätsvermögen verfügen. Der erste Teil dieser Arbeit beschreibt die Synthese von polycyclischen aromatischen Kohlenwasserstoff (PAH)-substituierten, Trimethylphosphan-stabilisierten Diborenen. Im zweiten Abschnitt dieser Arbeit wird die Synthese von Diborenen beschrieben, welche in einer Dihydroanthracendiyl-verbrückten Ringstruktur eingebunden sind.
Die Dissertation befasst sich mit der Reaktivität von 1,2-Bis(dichlorboryl)benzol. Im ersten Kapitel wird auf die Problematik bei dessen Synthese eingegangen. Der zweite Teil der Arbeit befasst sich mit der Bildung von entsprechenden Boran-Addukten mit verschiedenen Lewis-Basen. Das dritte Kapitel beschreibt die Synthese eines neuartigen, vollständig ungesättigten 1,2-Diboretdiradikals, welches durch die schrittweise Reduktion des 1,2-[(CAAC)BCl2]2-Benzols erhalten wurde. Darüber hinaus konnte bei dieser schrittweisen Reduktion ebenfalls das einfache Borylradikal, das nicht-cyclische Diradikal und das dianionische gespannte C2B2-Ringsystem erhalten werden. Anfängliche Reaktivitätsstudien zum 1,2-Diboretdiradikal zeigen zudem, dass die B-B-Bindung durch Umsetzung mit Kohlenstoffmonoxid gespalten und so ein Bisborylen dargestellt werden kann. Im vierten Kapitel konnte das 1,2-Bis(dichlorboryl)benzol durch Transmetallierungsreaktionen zu verschiedenen, sich in ihren Eigenschaften stark unterscheidenden, Verbindungen umgesetzt werden. So konnte das fluoreszierende ortho-phenylenverbrückte Bis-9-Borafluoren erhalten werden, aus welchem durch Wärmezufuhr das ebenfalls fluoreszierendes diboraanthracenartige Umlagerungsprodukt gewonnen werden konnte. Beide Verbindungen wurden auf ihre photophysikalischen und elektrochemischen Eigenschaften untersucht. Weiterhin konnten polycyclische Boracyclen mit C10B2-Gerüst erhalten werden, bei welchen instantan die selektive Bildung von zwei chiralen Zentren über eine Vielzahl an B-C-Bindungsbrüchen und -knüpfungen beobachtet wurde. Zuletzt konnte ein thermisch empfindliches, potentiell explosives Azid-verbrücktes Azidoboran dargestellt werden, bei welchem eine Staudinger-artige Reaktivität beobachtet werden konnte.
This Ph.D. thesis has addressed several main issues in current ASSB research within four studies. Ceramic ASSBs are meant to enable the implementation of Li-metal anodes and high voltage cathode materials, which would increase energy density, power density, life time as well as safety aspects in comparison with commercially available liquid electrolyte LiBs. In this thesis, several scientific questions arising on the cathode side of ASSBs have been focused on. With respect to the target system of a ternary composite bulk cathode consisting of ceramic active material, ceramic SSE and an electrically conductive component, studies about the thermal stabilities of these components and their impact on the electrochemical performance have been conducted. Particulate bulk cathode composites have to fulfil electrochemical, chemical, mechanical and structural requirements in order to compete with commercial LiBs. Particularly, the production process requires high-temperature sintering to obtain firmly bonded contacts in order to maximize the electrochemically active area, charge transfer and ionic conduction. However, interdiffusion, intermixing and decomposition of the initial components during sintering result in low-performing ASSBs so far.
These side reactions during high-temperature treatment have been investigated in order to gain a better understanding of these mechanisms and to enable a better controlling of the manufacturing process as well as to simplify the choice of material combinations. The first two parts of this thesis deal with the thermal stability of the ceramic SSE LATP in combination with various active materials and with the validation of a probable improvement of the sintering process due to liquid phase sintering of LATP by adding Li3PO4. In the third and fourth parts, the impact of interdiffusion, intermixing and decomposition on the electrochemical performance of TF-SSBs based on the active material LMO and the ceramic SSE Ga-LLZO has been investigated.
Im Rahmen dieser Arbeit wurde die Reaktivität des Phosphorans (C2F5)3PF2 gegenüber Lewis-Basen (N-heterozyklische Carbene und Phosphane) und gegenüber verschiedenen Übergangsmetall-Fluoridokomplexen untersucht. Im ersten Teil werden die Lewis-Säure/Base-Addukte zwischen (C2F5)3PF2 und verschiedenen
N-heterozyklischen Carbenen (NHCs) beschrieben. Der Fokus des zweiten Teils der Arbeit liegt auf der Darstellung kationischer Komplexe ausgehend von neutralen d-Block-Metallfluoriden, welche durch Fluorid-Transfer auf das Lewis-acide (C2F5)3PF2 erfolgt. Hierbei wurden Komplexe verschiedener Übergangsmetalle (Ti, Ni, Cu) verwendet, wodurch der Fluorid-Transfer auf das Phosphoran quer über die 3d-Reihe untersucht wurde. Im letzten Kapitel dieser Arbeit wurden die Synthese und die Anwendung von Kationen des Typs [(NHC)Cu]+ eingehender untersucht. Dazu wurde zunächst die Synthese der Ausgangsverbindungen [(NHC)Cu(F)] modifiziert. Anschließend wurden diese Fluorido-Komplexe auf deren Reaktivität gegenüber (C2F5)3PF2 untersucht. Nachfolgend wurden die Reaktivität von [(Dipp2Im)Cu(C6Me6)]FAP in Ligandenaustauschreaktionen bzw. die Synthese von Komplexen [(Dipp2Im)Cu(LB)]FAP (LB = Lewis-Base) eingehender untersucht.
Die Dissertation befasst sich mit der Synthese und Reaktivität verschiedener niedervalenter Borverbindungen. In dem ersten Kapitel der Arbeit wurde das CAAC-stabilisierte Cyano(hydro)borylanion auf seine Bor- sowie Stickstoff-zentrierte Nucleophilie hin untersucht. Das ambidente Reaktionsverhalten der Verbindung konnte gegenüber verschiedenen Kohlenstoffelektrophilen sowie Monohalogenboranen nachgewiesen werden. Der zweite Teil der Arbeit befasst sich mit der Aktivierung, Fixierung und Verkettung von Distickstoff durch Borylene. Es gelang den Mechanismus experimentell sowie quantenchemisch aufzuklären. Das Folgeprodukt der Protonierung, welches ein Bisborylhydrazindiradikal darstellt, wurde weitergehend auf seine Reaktivität als Reduktionsmittel untersucht und konnte selektiv einfach sowie zweifach oxidiert werden. Das dritte Kapitel beschreibt die Synthese eines neuartigen, vollständig ungesättigten 1,2-Diboretdiradikals, welches durch die schrittweise Reduktion des 2,3-[(CAAC)BBr2]2-Naphthalins erhalten wurde. Anfängliche Reaktivitätsstudien zu dem 1,2-Diboretdiradikal zeigen zudem, dass die Verbindung als Bor-Bor-Mehrfachbindung gegenüber einem Azid reagiert, jedoch durch die Umsetzung mit Kohlenstoffmonoxid auch zu einem Bisborylen gespalten werden kann.
The 2- and 2,7- substituted para-N-methylpyridinium pyrene cations show high-affinity intercalation into ds-DNAs, whereas their non-methylated analogues interacted with ds-DNA/RNA only in the protonated form (at pH 5), but not at physiological conditions (pH 7). The fluorescence from non-methylated analogues was strongly dependent on the protonation of the pyridines; consequently, they act as fluorescence ratiometric probes for simultaneous detection of both ds-DNA and BSA at pH 5, relying on the ratio between intensities at 420 nm (BSA specific) and 520 nm (DNA specific), whereby exclusively ds-DNA sensing could be switched-off by adjustment to pH 7. Only methylated, permanently charged pyrenes show photoinduced cleavage of circular DNA, attributed to pyrene-mediated irradiation-induced production of singlet oxygen. Consequently, the moderate toxicity of these cations against human cell lines is strongly increased upon irradiation. Detailed studies revealed increased total ROS production in cells treated by the compounds studied, accompanied by cell swelling and augmentation of cellular complexity. The most photo-active 2-para-N-methylpyridinium pyrene showed significant localization at mitochondria, its photo-bioactivity likely due to mitochondrial DNA damage. Other derivatives were mostly non-selectively distributed between various cytoplasmic organelles, thus being less photoactive.
Ionic liquids-assisted ring opening of three-membered heterocycles with thio- and seleno-silanes
(2022)
Ring opening reactions of strained heterocycles (epoxides, aziridines, thiiranes) by silyl chalcogenides, such as thiosilanes and selenosilanes, can be efficiently performed in a variety of ionic liquids, which can behave as reaction media and in some cases also as catalysts. This protocol enables an alternative access to β-functionalized sulfides and selenides under mild conditions.