- About
-
The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
provided by the
Networked Digital Library of Theses and Dissertations.
Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
Search results
Showing 51 to 60 of 129 (0.064 seconds)| 51 |
Spatial correlation of electrons in some atoms and moleculesBhattacharya, B. January 1953 (has links)
No description available.
|
| 52 |
The role of chirality in the structure and properties of supramolecular nanotubesAnderson, T. W. January 2011 (has links)
The naphthalene diimide (NDI) nanotube is a self-assembly supramolecular system marked by intriguing properties and behaviour. The chirality of each NDI monomer determines the helicity of the nanotube, held together by non-covalent interactions and capable of reversible destruction and formation. The nanotube acts as a receptor for C<sub>60</sub> and many other molecular guests. The same NDIs can also assemble into a distinct hexameric receptor for C<sub>70</sub>. In this thesis, the central role of chirality in the NDI assemblies is explored. Chapter 1 provides a general review of supramolecular chemistry; of the non-covalent interactions behind the assembly of supramolecular systems; of examples of the sergeants-and-soldiers effect, in which chiral ‘sergeant’ monomers may impose a preferred supramolecular structure or achiral ‘soldier’ monomers; of other published nanotube-based systems. All that was known about the NDI nanotube prior to the commencement of this work is described. Chapter 4 explores the possibility of sergeants-and-soldiers behaviour in NDI nanotubes. New achiral NDI monomers are synthesised, and problems both synthetic and analytical are overcome. A solvent dependence is discovered and exploited. Finally, sergeants-and-soldiers behaviour is observed, with some achiral NDIs acting as superior ‘soldiers’ to others. The reasons behind this are considered and a theoretical framework outlined to explain these discoveries. The impact of mixed chiral/achiral nanotubes upon C<sub>60</sub> uptake is examined. Chapter 3 covers the synthesis of new monochiral NDIs, with one chiral and one achiral centre. The use of these NDI saws sergeants is examined, with some surprising results. The interaction of monochiral NDIs with C<sub>60</sub> and C<sub>70</sub> is also considered. In Chapter 4 the physical properties of the nanotube are investigated, with a range of experiments examining issues such as solvent dependence and majority-rules behaviour.
|
| 53 |
A theoretical study of some conjugated moleculesJenkins, D. P. January 1952 (has links)
No description available.
|
| 54 |
The stereochemistry of novel types of heterocyclic phosphorus compounds : studies in the benzimidazoquinazolinesDavis, M. January 1963 (has links)
No description available.
|
| 55 |
The stereochemistry of tetrasubstituted piperazinesHook, R. G. January 1962 (has links)
No description available.
|
| 56 |
Asymmetric studies of (1,2)-and (2,3)-sigmatropic rearrangment of ammonium ylidsPonce, Melanie January 2010 (has links)
No description available.
|
| 57 |
Highly enantioselective synthesis of amines by asymmetric hydrogenationLi, Chaoqun January 2009 (has links)
No description available.
|
| 58 |
Oriented transformations in the system MnO-O-H2-OSmith, I. B. January 1966 (has links)
No description available.
|
| 59 |
The application of spectroscopic studies to some structural problems in inorganic chemistryEvans, J. A. January 1966 (has links)
No description available.
|
| 60 |
Conformational aspects of model peptide systemsWilliams, M. K. January 1974 (has links)
No description available.
|
Page generated in 0.1843 seconds