Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 15 of 15 for “"Supramolekulare Chemie"”.
-
Azacryptanden und strukturanaloge Podanden: Rezeptoren für Kationen und Anionen
… sowie anderseits auf Fortschritten, welche die supramolekulare Chemie in diesem Zusammenhang durch den zielgerichteten Aufbau maßgeschneiderter Rezeptoren eröffnet. Gegenwärtig sind eine Vielzahl unterschiedlicher Liganden zur Komplexierung von Kationen und Anionen bekannt. Dabei ist besonders …
-
Synthese und Screening einer kombinatorischen Rezeptorbibliothek für biologisch relevante Tetrapeptide
Im Rahmen der hier vorliegenden Doktorarbeit wurde eine 512 Mitglieder umfassende kombinatorische Rezeptorbibliothek auf der Basis eines Guanidiniocarbonylpyrrols mit einer tripeptidischen Seitenkette dargestellt werden. Die kombinatorische Synthese der Bibliothek erfolgte nach der „Split and Mix“ …
-
Pinzettenförmige Moleküle mit Wasserstoffbrücken-Donor-Akzeptor-Einheiten : potentielle Kandidaten zur Anwendung in der dynamisch kombinatorischen Chemie
The presented thesis discusses the synthesis of receptors and receptor libraries containing molecules with labile side chain functionalities. These molecules are able to interact with guest species via hydrogen bonding. Building blocks for the libraries are tweezer-type molecules, which are …
-
Eine molekulare Fliegenfalle zur Erkennung von biologisch relevanten (poly)-anionischen Substraten
Im Rahmen dieser Arbeit konnte ein multivalenter Rezeptor auf Basis von Guanidiniocarbonylpyrrolen zur Komplexierung von biologisch relevanten (poly)- anionischen Substraten wie Citrat, Malat und Tatrat dargestellt werden. Der Rezeptor bindet Citrat selbst in Gegenwart eines 1000fachen Überschusses …
-
Zweikernige Titan-(IV)-komplexe als Enzymmimikry
Enzymes are natural molcular machines, which control chemical reactions in biological systems. Although they consist of only about 20 aminoacids, they are highly complex and show great variety. Two-centered metalloenzymes are an important class of enzymes, which contain two metal-ions as active …
-
The versatile use of Guanidiniocarbonylpyrroles : from self-assembly to peptide recognition
… gliedert sich in zwei Themenschwerpunkte. Ein supramolekulares Projekt beinhaltete die Entwicklung von neuen flexiblen, selbst-aggregierenden Zwitterionen als Bausteine für supramolekulare Polymere. In einem zweiten bioorganischem Teil bestand das Ziel darin, Rezeptoren für Aminosäuren und …
-
Selbstorganisation von Helicaten und molekularen Tetraedern
In this research hierarchical multi component self-assembly processes were investigated. The two ligands 2,3-dihydroxybenzaldehyde and 2,3-dihydroxyacetophenone were used for the multistep self-assembly of helicate-type dinuclear titanium(IV) or gallium(III) complexes in the presence of lithium …
-
CxNy-materials from supramolecular precursors for “All-Carbon” composite materials
Among modern functional materials, the class of nitrogen-containing carbons combines non-toxicity and sustainability with outstanding properties. The versatility of this materials class is based on the opportunity to tune electronic and catalytic properties via the nitrogen content and –motifs: …
-
Funktionalisierte hierarchisch gebildete Helicate
The work bases on synthesis and study of helicates formed by hierarchical self-assembly. Self-assembly plays an important role in nature as well as in many chemical processes. Small building blocks assemble to supramolecules. For molecular recognition, perfect design of the sub-units is essential …
-
Homo- and heterodinuclear luminescent helicates
The specific photophysical properties of the NIR-emissive lanthanide-based complexes attract much attention due to the potential applications in medical diagnostic and optoelectronics. On the other hand, luminescent helicates are in the focus of attention of supramolecular chemistry. In this …
-
Relevanz und Nutzung von Anionen-pi Wechselwirkungen
In this thesis the relevance and the use of a new intermolecular force between anions and electrondeficient arenes was investigated. In the last ten years the anion-pi interaction has gain a growing interest in the supramolecular community. It should be useful for the design of novel anion …
-
Enantiomerenreine beta-Diketonate für lumineszierende helicat-artige Komplexe
The work bases on ß-diketonates which all bear a chiral spacer and the following complexations lead to enantiomerically pure helicates. All ligands were synthesised by a Claisen-type condensation reaction . During the work a huge number of optimisation attempts of the coupling reaction, as well as …
-
Synthese und Untersuchung heterocyclischer Anion-Rezeptoren
An area of continuing interest in supramolecular chemistry that continues to attract attention is the binding of anions. The rapid developments in this area are due to the many roles that anions play in biology, medicine, catalysis and the environment. In this thesis receptors based on quinoline, …
-
Hierarchische Selbstorganisation von Helicaten mit substituierten 8-Hydroxychinolinliganden
Aim of this work was the synthesis of complexes with different divalent metals, starting from alkyl 8-hydroxyquinoline-7-carboxylate and 1-alkyl-3-(8-hydroxyquinolin-7-yl)urea and investigations of the monomer-dimer-equilibrium. Hydrophilic and hydrophobic ligands had been done and used …
-
Metallo-supramolecular Architectures based on Multifunctional N-Donor Ligands
Self-assembly processes were used to construct supramolecular architectures based on metal-ligand interactions. The structures formed strongly depend on the used metal ion, the ligand type, the chosen counter ion and solvent as well as on the experimental conditions. The focus of the studies was …