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 20 of 79 for “"F100 - Chemistry"”.
-
Excited state intramolecular proton transfer (ESIPT) to nitrogen in heterocyclic compounds
… were prepared in order to study the photochemistry of these compounds when ESIPT is not possible. The absorption and fluorescence properties of these systems were studied as a function of solvent, temperature and pH conditions. Lifetimes, quantum yields and pKa data were determined under …
-
The synthesis and ion-exchange chemistry of vanadium doped natisite and paranatisite
With 440 commercial nuclear reactors in use globally, nuclear energy contributes to 11 % of the world’s energy demands[1]. Like most forms of energy, nuclear energy generates waste. To help manage contaminated aqueous streams generated from the nuclear cycle, i.e., reactor primary coolant and the …
-
New photosensitisers for photodynamic therapy
The Photodynamic Therapy (PDT) of cancer is a relatively new area of cancer research. It involves the use of tumour specific drugs that are non-toxic in the absence of light but, when irradiated, react either with oxygen to give the cytotoxic singlet oxygen or directly with biomolecules and so …
-
The synthesis, characterisation and photochemistry of novel organometallic complexes
… metal can radically alter the ligand photochemistry. In order to investigate these effects, we synthesised a series of organometallic complexes with several different modes of ligand-metal bonding. The synthesis of various cyclopentadienyl, arene, diene and enone complexes was attempted. …
-
Fluorescent sensors for metal ions
… in many fields including trace analysis in chemistry and biochemistry. Using the "dual fluorescence" properties of TICT state compounds (Twisted Intramolecular Charge Transfer which gives an extra red-shifted emission band) and the key property of crown ether compounds which is their ability …
-
Trans coordinating bidentate ligands
A number of novel bidentate ligands have been designed, which would, because of steric constraints, coordinate exclusively across the trans positions in a square planar complex. Such complexes could show optical activity centred on the metal if the four ligand groups (A,B,C,IJ in the diagram) were …
-
Thermally Responsive Peptide Coated Superparamagnetic Iron Oxide Nanoparticles for Drug Delivery
Target specific delivery of anticancer drugs to the effected site without showing systematic toxicity to normal tissues is important. Multifunctional biodegradable delivery systems reduce systematic toxicity in an efficient manner. These drug carriers should provide controlled release, be directed …
-
A study of the effect of Si:Al Ratio and ion-exchange on the ability of the zeolite ZSM-5 to adsorb common analgesics from waste water
Due to the expansion of the pharmaceutical industry, the increase in demand and current inadequate removal methods, pharmaceutical waste has been increasing in concentration in environmental waters. It is unknown what the chronic effects this waste could have on humans and so more adequate removal …
-
Alkyl, alkenyl and cycloalkyl substituted triphenylmethane dyes
A series of Malachite Green derivatives containing alkyl an alkenyl substituents in the 2-, 3-. and 4- positions has been synthesised. Their respective visible absorption spectra have been correlated with the electronic and steric effects of the methyl, ethyl, propyl, butyl and vinyl substituents …
-
An investigation into the active sites in co-reactants for carbonless copying paper
… is a study of certain aspects of the surface chemistry of materials used as co-reactants in carbonless copying paper and of some materials which show promise for such a use. The areas investigated include the ion exchange characteristics of acid activated clays, the reactivity of a primary …
-
Solvolysis of cobaltammines
The reactions studied were the aquaton of chloropentammine cobalt III chloride and the anation of aquopentanmine cobalt III ions with chloride ions in various e thanol—water rixtures. First order kinetics were observed for the aquation reaction being first order in cobalt concentration. The rate of …
-
Palladium and platinum complexes of trans-coordinating bidentate phosphine ligands
Two ditertiary phosphine ligands, 1,6.-bis(diphenylphosphino)-hexane, (dPh), and 3,31_bis(diphenylphosphinomethyl)biphenyl, (PP), have been used in the preparation of complexes described in this work. Construction of molecular models proved useful in predicting the likely geometries of the …
-
Synthesis of metal containing liquid crystals
The primary objective of the present study was to develop mesogenic metal complexes. Part of this work was concerned with the synthesis of structural analogues of existing mesogenic bis-1,2-dithiolatonickel(II) complexes to explore the impact of structural variations on the mesophase behaviour of …
-
Effects of magnesium and calcium upon excitation-contraction coupling in the heart
Calcium (Ca2 ) availability to cardiac myofilaments is the primary factor determining the force of cardiac contraction. An intracellular organelle, the sarcoplasmic reticulum (SR), regulates the relaxation of the muscle as well as acting as a source of activating Ca2 during excitation-contraction …
-
Routes to complexes of open chain polyethers
… it was decided to study the co-ordination chemistry of t-butyl phosphonate with platinum(ll). In reactions between (RO)2PHO and [PtC12(COD)], (COD = cyclo-octa- 1,5-diene) greater steric hindrance when R = t-Bu inhibits formation of the normal product [Pt((RO)2POH)2{(RO)2P0)2] (R = Me, Et …
-
A study of adsorptive bubble separation methods for removal of metal ions from aqueous solution
A study has been made of the removal of the copper (II) ions from aqueous solution by dispersed-air flotation, dissolved-air flotation and liquid-liquid extraction techniques. Precipitation of the copper (II) species has been achieved by complexing with a long-chain a-dioxime, …
-
Solution photochemistry of derivatives of Michler's Ketone
A series of analogues of 4,4-bisdimethylaniinobenzophenone, Michler's ketone, in which the terminal dimethylamino-groups have been replaced by diethylamino, pyrrolidino, piperidino, N-methylpiperazino and morpholino moieties has been prepared utilising the reaction between an aryl-lithium and a …
-
Some chemistry of chromenes and chromanones
A range of 2-substituted, symmetrically and unsymmetrically 2,2- disubstituted and 2-spiro-annulated chroman-4-ones has been synthesised by the pyrrolidine catalysed condensation of 2-hydroxyacetophenones with aldehydes and ketones. The synthesis has been extended to yield 5-, 6, 7- and 8- …
-
The chemistry of some heterocyclic analogues of triphenylmethane dyes
A comprehensive series of triphenylmethane dyes has been synthesised in which the phenyl ring of Malachite Green has been replaced by a 5- or 6- membered heterocycle containing nitrogen, oxygen or sulphur as hetetâacoins. The visible absorption spectra of the dyes have been correlated with the …
-
A study of benzazole derivatives showing large stokes shifts
A series of benzazoles has been synthesised, generally by reacting a salicylic acid derivative with a 2-substituted aniline in the presence of phosphorus trichloride. Solid state fluorescence properties of benzazoles bearing a phenyl , naphthyl or coumarinyl substituent at the 2-position have been …
Page 1 of 4