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  • 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.
1

Some mass spectrometric studies of negative ions in the gas phase

Stapleton, Barbara Jane January 1976 (has links)
v, 158 leaves : ill. ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Thesis (Ph.D.)--University of Adelaide, Dept. of Organic Chemistry, 1978
2

The ¹³C NMR spectra of conjugated carbanions and preparation and thermal behavior of 3-vinylcyclooctadienyl anion

Davidson, Ellwood Ward, 1942- January 1972 (has links)
No description available.
3

Nonatetraenyl anion and homocyclooctatetraene dianion

Mayall, Bruce Ian, 1939- January 1975 (has links)
No description available.
4

Some rearrangement reactions in negative ion mass spectrometry / by A.C. Ho

Ho, Ah Chai January 1975 (has links)
Reprints of 2 articles published by the author bound in back of publication / iv, 170 leaves : ill. ; 26 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Thesis (Ph.D.)--University of Adelaide, Dept. of Organic Chemistry, 1976
5

Lanthanide architectures, rotaxanes and responsive d-f assemblies

Tropiano, Manuel January 2013 (has links)
No description available.
6

Spectroscopic studies of [alpha],[omega]-diphenylpolyenyl anions

Ogle, Mark Edward 12 1900 (has links)
No description available.
7

An investigation of anion binding by acyclic metal-centred receptors

Graydon, Andrew R. January 1995 (has links)
This thesis reflects two main aims. Firstly, the synthesis and characterisation of a number of potential anion receptors was undertaken and their anion binding properties were assessed. In so doing, a second aim was fulfilled, namely a comparison of the various methods of detecting the bound anion, and quantifying the binding strength. Four techniques appear in this thesis; <sup>1</sup>H nuclear magnetic resonance, UV-visible spectroscopy, electrochemistry and luminescent emission. Quantitative titrations were performed and, where possible, stability constants estimated. Chapter One provides an introduction to some of the themes of molecular recognition and provides a brief overview of the literature associated with anion recognition. A Prologue describes the design of the receptors studied; they all incorporate a metal centre and appended amide groups which provide sources of hydrogen bonding. The molecules are mostly cationic and a combination of positive charge and hydrogen bonding constitutes the binding interaction. Chapter Two is concerned with receptors based on cobalticinium, [Cp<sub>2</sub>Co]<sup> +</sup> . A number of receptors are presented and are found to bind anions with stability constants typically in the range of 500-1000 dm<sup>3</sup>mol<sup>-1</sup> . Receptors involving more than one cobalticinium centre are found to bind much more strongly and, furthermore, variations in functional groups appended close to the proposed coordination site impart selectivity; dihydrogen phosphate is bound more strongly than chloride. It is also found that different techniques give different stability constants and comment is made on this phenomenon. Chapter Three examines the role of positive charge in anion binding and describes the synthesis and coordination properties of several neutral receptors. These molecules retain hydrogen bonding sites, and it is found that this is sufficient to bind anions, but the strength of the interaction is greatly reduced. Chapter Four introduces another system, based on RuL(bpy)<sub>2</sub><sup>2+</sup> , where L is a 4,4'-amide disubstituted bpy. The strength of binding is an order of magnitude greater than the cobalticinium systems as detected by several methods including emission studies, which are very sensitive. Comparison with a neutral, rhenium-based receptor is made. A dihydrogen phosphate-selective luminescent sensor is also presented. The Epilogue identifies areas for future research. Specialised introductions and summaries are found at the beginning and end of each chapter.
8

Halogen- and hydrogen-bonding cyclic and interlocked hosts for anion recognition and sensing

Gilday, Lydia C. January 2013 (has links)
This thesis describes the synthesis of macrocyclic and interlocked receptors which exploit halogen- and hydrogen-bonding intermolecular interactions for anion recognition. <strong>Chapter One</strong> introduces the field of supramolecular chemistry, with particular focus on applications of host–guest chemistry to anion coordination and anion templation in the construction of mechanically interlocked molecules. <strong>Chapter Two</strong> details the synthesis of a series of cyclic and cage-like porphyrin-based receptors which bind anions through halogen- and hydrogen-bonding interactions. The ability of these receptor systems to bind and sense anionic guest species is investigated and comparisons between hydrogen- and halogen-bonding are discussed. <strong>Chapter Three</strong> reports anion-templated pseudorotaxane assemblies stabilised by both halogen- and hydrogen-bonding. The related catenanes are also prepared and their affinity for anions is investigated. The first examples of interpenetrated and interlocked architectures constructed by a single charge-assisted halogen bond are also reported. <strong>Chapter Four</strong> describes the synthesis of a 1,3-dialkyl-1,2,3-triazolium-containing threading component, whose anion binding properties are studied and compared with other threading molecules. The ability of this novel thread to form pseudorotaxanes is investigated and the preparation of the related rotaxane species is outlined. <strong>Chapter Five</strong> discusses attempts to prepare rotaxanes with improved anion binding affinities through increasing the lipophilicity of the anion binding clefts. Several novel rotaxanes are described and their anion binding properties are probed. <strong>Chapter Six</strong> describes the experimental procedures used in this work and the characterisation of compounds presented in chapters two to five. <strong>Chapter Seven</strong> summarises the conclusions of this thesis.
9

Infrared Studies of Anions of Barbituric Acids

Barnhart, Richard Lee 08 1900 (has links)
As long ago as 1881, it was realized that a functional group of atoms in a molecule would cause an absorption band to appear at a particular frequency in the infrared spectrum of the molecule. In more recent years, the concept of characteristic group frequencies has become firmly established and has resulted in the present widespread use of infrared spectroscopy. There appear to have been relatively few studies of infrared absorption of organic acids as compared with their salts.

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