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 86 for “"Spectroscopic Properties"”.
-
STABILITY AND SPECTROSCOPIC PROPERTIES OF NEGATIVE IONS
Negative ions play an important role in chemistry as building blocks of salts and oxidizing agents. Halogen atoms, due to their ability to attract electrons, readily form negative ions. Considerable interest exists in the design and synthesis of new negative ions called superhaogens whose electron …
-
Hydroxylamine-N, N-disulphonates and nitrosodisulphonates: preparations, characterizations, and magnetic and spectroscopic properties
A series of hydroxylamine-N,N-disulphonate and nitrosodisulphonate salts with monovalent cations have been prepared and characterized. The salts of the hydroxylamine-N,N-disulphonate ion crystallize with either [(S03)2NOH]2- ions or {[ (S03)2N0]2H}5- groups. In general, salts with [(S03)2NOH]2- …
-
Ab initio computational applications of electronic structure and spectroscopic Properties of bulk Crystalline materials
… have amazing chemical, physical and mechanical properties, but puzzling structures. The uncertain stoichiometric value of foreign elements in boron-rich compounds greatly influences the physical and chemical properties. To study this effect, pure elemental boron which has six allotropes …
-
The effects of metal ion and ligand substitution on the spectroscopic properties of metal complexes.
Metal-nitrogen stretching vibrations in Co(II), Ni(II), Cu(II) and Zn(II) chloride 4-methylaniline complexes are assigned by ¹⁵N-labelling in conjunction with a consideration of the relative crystal field stabilizition energies of the metal ions. Bands in the ultraviolet electronic spectra of …
-
Investigation into the unique coordination and spectroscopic properties of lanthanide ions with dipyridylamine and dipicolylamine based ligands.
… and a lithium complex, as well as photophysical properties were investigated and revealed that the compounds that were developed did not sensitize lanthanide ion luminescence. Isolation of the first metal complexes showed no coordination was present in the solid-state structure, but rather the …
-
Multi-Method Investigation of the Mechanism of Surfactant-Induced Chromatotropism of Metal-Chelometric Dye Complexes
… change the ultraviolet-visible (UV-vis) spectroscopic properties of certain metal-dye complexes has been largely ignored in the chemical literature. In this manuscript a model is developed to describe this mechanism. Intramolecular forces among surfactant molecules and host molecules are …
-
DERIVATIVES OF 1-PHENYL-1-NONEN-3-ONE AS POTENTIAL BIOLOGICAL ALKYLATING AGENTS
The-preparation, spectroscopic properties and antineoplastic activities of a series of alkyl styryl ketones are presented. Unsaturated ketones are known to have alkylating properties. 1-Phenyl-1-nonen-3-one (51) and nuclear substituted derivatives were prepared as potential biological alkylating …
-
Studies on the Biosynthesis of Protochlorophyllide Ester in Etiolated and Green Tissues of Higher Plants
… acid (ALA) accumulated a pigment which had the spectroscopic properties of Mg-protoporphyrin monomethyl ether (MPE) but physical properties similar to those of protochlorophyllide (Pchlide) ester. When this compound was subjected to demetallation and acid hydrolysis the resulting porphyrin had …
-
Biochemical and spectroscopic insights into peculiar active site structures and biosynthesis of O2-tolerant [NiFe]-hydrogenases
… Previous studies unveiled unusual structural and spectroscopic properties of the oxidized enzyme. Here, we present evidence by protein biochemistry in combination with infrared spectroscopy that the peculiar active site structure is causative for the unusual spectroscopic properties and probably …
-
Cd3P2 Quantum Dots As Sources for Quantum Emission and Detection of Near-IR Radiation
… Cd3P2 CQDs. We have employed a variety of spectroscopic methods to analyze the properties of bare Cd3P2 CQDs. Using transmission electron microscopy (TEM) images and UV-visible absorbance spectra, we show the development of a sizing curve for Cd3P2 CQDs and how this sizing curve can be used …
-
Studies on conducting polymers : the synthesis and anodic electropolymerisation of novel B-functionalised thiophenes
… of their respective thiophene moieties. The spectroscopic properties of these novel compounds, including their electrochemical behaviour, are presented.
-
Electrochemical and Spectroelectrochemical Studies of Complexes with Multiple Redox Centers
The electrochemical and spectroscopic properties of different types of complexes with multiple redox centers were investigated. Cyclic voltammetry was used as the main electrochemical technique along with thin-layer UV-visible and FTIR spectroelectrochemistry. The primary focus of this work was to …
-
Approaches to the synthesis of diazabiphenylenes
… of which were established on the basis of their spectroscopic properties and also those of their N,N'-bis(4-nitrobenzoyl) derivatives. The N,N'-dibenzyl derivative of the latter dilactam was reduced with lithium aluminium hydride to the known tertiary amine. The catalytic dehydrogenation of the …
-
Planar integrated optical waveguide chemical sensors and novel transducer layer materials
… they are chemically prepared, their physical properties and chemical properties are easily tailored through chemical means or processing conditions. The fact that sol-gel bulks and films are prepared at room temperature allows the immobilization of heat labile species such as organic …
-
Cyclopentenoid Cyanogens: Their Chemistry, Importance in Plant Systematics, and Their Role in the Coevolution of Plants and Insects (Phytochemistry, Cyanogenic, Glycosides, Nmr)
… were devised, and data accumulated on their spectroscopic properties. The distribution of cyclopentenoid cyanogens in plants was investigated, and it was determined that members of the Passifloraceae, Turneraceae, Malesherbiaceae, Flacourtiaceae and Caricaceae elaborate these compounds. The …
-
Fabrication and characterization of Phosphate-based planar waveguides activated by Er3+ ions
… films fabrication, which effects on spectroscopic properties of the waveguiding systems: losses, refractive index. In case of RF-sputtering is no-ticeable that the refractive index is low, and the losses are less than 0.2 dB/cm, however the multicomponent target material increase the …
-
Thermal degradation of organophosphorus compounds.
… are proposed for the isolated compounds and the spectroscopic properties of authentic samples compared with those of the isolated compounds. The validity of the proposals is discussed and areas requiring further study indicated. A discussion of some of the mass spectra which have been obtained in …
Page 1 of 5