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.
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Showing 1 to 20 of 20 for “"Cyclophane"”.
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ALKYLATION AND OXIDATIONS OF SYMMETRICAL DIMETHYLENEBIPHENYL AND RELATED DIANIONS (CYCLOPHANE, BIPHENYLOPHANE, NMR, CONFORMATION).
… provides an excellent route to n.0 - and n.0.n.0 cyclophanes. An X-ray study on 14.0 paracyclophane showed it to have a conformation different from that observed in solution by NMR; MM2 calculations were used in determining what the solution conformation is likely to be. Oxidation of the dianions …
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Spectroscopic Studies of Inclusion Host-Guest Complexes Between Cyclophane Corrals and Polcyclic Aromatic Hydrocarbons
Cyclophanes are macromolecules that are known to effectively bind with molecules to form host-guest complexes. Several cyclophane molecules, referred to as corrals (1-6) by their founders, have been synthesized. The characterization of these compounds and their complexes has been investigated using …
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Investigation of the Triplet State Properties of Bis(chlorophyll)cyclophane and Its Partially Metalated Derivatives
Bis(chlorophyll)cyclophane was originally synthesized as a model system for the light to energy conversion in green plant photosynthesis. The molecule is two synthetically linked chlorophyll macrocycles stacked center to center with the Q(,y) transition dipoles of each macrocycle perpendicular. …
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Expanded cyclophanes for switchable capture/release of metal complexes
The thesis, entitled ‘Expanded Cyclophanes for Switchable Capture/Release of Metal Complexes’ is separated into four main chapters. The first chapter focuses on the introduction of cyclophane receptors and the use of cyclophanes in molecular machines and some other potential applications. Then, an …
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Biosynthetic and bioinformatic investigation of RiPPs with radical SAM-installed crosslinks
… xenorceptide A2 have increased the prominence of cyclophane-containing rSAM-modified RiPPs. These molecules each target the β-barrel assembly machinery complex (BAM) in gram-negative bacteria. Chapter 2 focuses on the biosynthesis of darobactin A, combining experimental and computational analyses …
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The synthesis and chemistry of the cyclophanenes and their metal complexes
A new synthetic route to cyclophanenes 56, starting from an appropriate 2,6-dihalogen-substituted toluene via monothiacyclophanes as intermediate compounds, was developed. By this method, anti-5,8,13-16-tetramethyl [2,2] (1,3)cyclophan-1-ene, 56b, and anti-4,6,8,12,14,16-hexa-methyl [2,2] …
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Templat-gesteuerte Synthese von Makrocyclen
… the macrocycle can be obtained. Symmetric cyclophanes which possess internal amine groups can be synthesized by using symmetric templates as terephthaldialdehyd. The imine bonds are easy to prepare and to remove and therefore they are a good choice for introducing and removing of the …
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Synthetic studies towards an organometallic rotaxane
… The formation of a rotaxane using the host cyclophane, cyclobis (paraquat-pphenylene), formed by a template effect, has been investigated using our chiral organometallic polyether.
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Shape-switching studies with cyclophanes and indicator displacement assays with boronic acids
… the synthesis and analysis of shape-switching cyclophane hosts with a range of molecular guests. This research serves as a contribution towards the field of molecular machines and switches which may gain utility in the fields of drug delivery or catalysis.<br/>
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Chemical modification of smectite clays
… will exchange onto a clay. The tetracationic cyclophane, and multipurpose receptor, cyclobis(paraquat-p-phenylene) undergoes ion exchange onto Wyoming bentonite to form a pillared clay with a very regular gallery height. The major plane of the cyclophane is normal to the silicate surfaces, …
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New Cyclophanes as Supramolecular Scaffolds: The Synthesis of Tribenzo-1,4,7-Triazacyclononatriene.
… is the synthesis and characterization of a novel cyclophane, tribenzo-1,4,7-triazacyclononene and derivatives thereof. These new cyclophanes should have greater versatility than the parent hydrocarbon macrocycle including greatly enhanced water solubility, ability to coordinate to metal ligands, …
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Synthesis and properties of benzannulenes and their metal complexes
A series of bis [e] and [a] fused dibenzannulenes/cyclophanes have been synthesized for the first time using benzyne-like intermediates (annulynes). These include the dibenzannulene trans-2,9-di-t-butyl-14c, 14d-dihydro-14c-14d-dimethyldibenzo[fg,op]naphthacene 82b, and the metacyclophanedienes …
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The synthesis and studies of type II porous liquids
… the work discussed in chapter 4 focuses on the cyclophane cyclobis (paraquat-p-phenylene), more commonly known as blue box (BB4+). Despite improvement towards the synthetic accessibility of BB4+ in recent years, the synthetic routes remain stepwise and are often low yielding unless harsh …
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Molecular Encapsulation of Conjugated Polymers for Organic Electronics
… Specifically, the study centeres on [n]paracyclophane-based ([n]PC) conjugated polymers, designed to investigate various effects. These include altering the cyclophane chiral centre by changing the ansa unit, modifying the polymer morphology by changing the side chains, and varying the …
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Synthese, Struktur und Reaktivität von [1]Borametallocenophanen
The synthesis of bis(cyclopentadienyl)- R2NB(eta5-C5H5)2 diindenyl- R2NB(eta5-C9H7)2 and mixed aminoboranes of the type R2NB(eta5-C5H5)(eta5-C9H7) (R = various alkyl) was described and the structure of the compounds in solution was determined by various NMR-methods. These ligand precursor molecules …
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Redox properties of Bis-Triarylamines and ligand properties of Thianthrenophane
… in a symmetry broken CT state. The [2.2]paracyclophane bridged dimer is an example for a weakly coupled system, because the spectroscopic behavior is very similar to the corresponding p xylene monomer. In contrast, anthracene as well as p-xylene bridges mediate a stronger coupling and reveal …
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Supramolecular effects on the reactivity and structure of radical ions derived from aromatic carbaldehydes and crownophanes
In this work, the influence of supramolecular effects on the reactivity and the geometry of radical ions is illustrated by two examples. (1) The reactivity of the radical anions of aromatic carbaldehydes towards the formation of semidiones depends on two main factors: the spin population at the …