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Full-Text Articles in Physical Sciences and Mathematics
The Use Of Fluorescence Quenching Measurements To Study The Cyclodextrin Inclusion Complexes Of 2-Aceotonaphthone, Elie K. Fraiji Jr
The Use Of Fluorescence Quenching Measurements To Study The Cyclodextrin Inclusion Complexes Of 2-Aceotonaphthone, Elie K. Fraiji Jr
Honors Theses
2-Acetonaphthone (2-AN) is an unusual molecule in that it will only fluoresce in the presence ot strong hydrogen bond donors such as water. Less than a 10 mol % addition of a weaker hydrogen bonding molecule such as ethanol results in significant quenching of the 2-AN fluorescence in water. We have used this behavior to monitor the binding of 2-AN to the ethanol-like interior of the α-, β-, and y-Cyclodextrin (CD) C2'1ities. The addition of CO's to aqueous solutions of 2-AN causes a dramatic quenching of the 2-AN fluorescence. Because the quenching is static, we attribute the observed behavior to …
Analysis Of Dolemitic Limestone Ore Using Direct Current Plasma Spectroscopy, Edward M. Kulback
Analysis Of Dolemitic Limestone Ore Using Direct Current Plasma Spectroscopy, Edward M. Kulback
Honors Theses
Four samples of dolemitic limestone ore, provided by the Thorne-Smith Company were analyzed for trace elements. Composition of limestone is important because this ore is often found with ground water (a primary source of drinking water); and in acidic conditions, certain elements can leach out of the ore and into the water supply, possibly in toxic levels, depending on the element. The elements that were found are: aluminum, iron, manganese, tin, and chromium. This last element is of particular concern because it appears in the ore in relatively high concentrations, and chromium can be a very toxic substance if its …
Linear Free Energy Correlations Of The Effect Of Substituents On The Cinnamaldehyde-Bisulfite Reaction, Susanne M. Hoff
Linear Free Energy Correlations Of The Effect Of Substituents On The Cinnamaldehyde-Bisulfite Reaction, Susanne M. Hoff
Honors Theses
This thesis was primarily concerned with the correlation of the kinetics and equilibrium of the cinnamaldehyde-bisulfite reaction with the effect of ortho, meta, and para substituents. The cinnamaldehyde-bisulfite reaction is seen below: where X=p-NMe2, p-MeO, p-Me, H, p-Cl, p-Br, p-NO2, m-Br, o-NO2, and o-MeO. The cinnamaldehydes were synthesized via a crossed aldol condensation reaction between acetaldehyde and the corresponding substituted benzaldehyde. The equilibrium constant and second order rate constant for the cinnamaldehyde-bisulfite reaction were determined through UV-visible spectroscopy. The equilibrium and kinetics data was then correlated by Hammet’s equation (log K/KH=pσ°) for the meta and para derivatives. In order to …
Conformational Energy Calculations Of The Pentapeptide Phe-Dphe-Asn-Gln-Tyr Of Tyrocidine, Douglas H. Reamer
Conformational Energy Calculations Of The Pentapeptide Phe-Dphe-Asn-Gln-Tyr Of Tyrocidine, Douglas H. Reamer
Honors Theses
By virtue of employing a modified version of a popular program for the calculation of polypeptide conformational energies, the lowest energy conformation of the tyrocidine molecule is being sought. This antibiotic molecule, a cyclic decapeptide, invited study due to its role in the process of bacterial sporulation in the Bacillus Brevis ATCC 818!2 strain. In the process of performing this investigation, lists of monopeptide lowest energy conformations, as determined by x-ray crystallographic studies, were combined to yield all possible combinations of half of the polypeptide chain. Beginning with a dipeptide, the conformations of lowest energy were calculated within a 'local-minimum' …
The Synthesis Of Allylic Organotin Compounds For The Enantioselective Formation Of Homoallylic Alcohols, Jean-Claude David Abed
The Synthesis Of Allylic Organotin Compounds For The Enantioselective Formation Of Homoallylic Alcohols, Jean-Claude David Abed
Honors Theses
Allylic tins when reacted with aldehydes are known to be diastereoselective for the resulting homoallylic alcohols. It is believed that a diastereomeric transition state can be created if the allylic tin contains a chiral ligand. Enantiomerically enriched α-pinene was chosen for the chiral ligand and brominated by an electroptilic addition of HBr to form enantiomerically enriched endo-2-bromobornane. This was then reacted with various alkyltin anions prepared from the chlorides, R3SnCl (R=Ph, Bu, & Me). Of the alkyltin chlorides chosen Me3SnCl produced the desired product in the best yield; the others were either very slow in reacting or unreactive. The final …