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Full-Text Articles in Physical Sciences and Mathematics
Bis(TetraEthylAmmonium) Oxalate Dihydrate, Timothy J. Mcneese, Robert D. Pike
Bis(TetraEthylAmmonium) Oxalate Dihydrate, Timothy J. Mcneese, Robert D. Pike
Arts & Sciences Articles
The title compound, 2C8H20N+ C2O4 22H2O, synthesized by neutralizing H2C2O42H2O with (C2H5)4NOH in a 1:2 molar ratio, is a deliquescent solid. The oxalate ion is nonplanar, with a dihedral angle between carboxylate groups of 64.37 (2). O—HO hydrogen bonds of moderate strength link the O atoms of the water molecules and the oxalate ions into rings parallel to the c axis. The rings exhibit the graph-set motif R4 4 (12). In addition, there are weak C—HO interactions in the crystal structure.
Carbonyl-Twisted 6-Acyl-2-Dialkylaminonaphthalenes As Solvent Acidity Sensors, Amy M. Green, Hannah R. Naughton, Zachariah B. Nealy, Robert D. Pike, Christopher J. Abelt
Carbonyl-Twisted 6-Acyl-2-Dialkylaminonaphthalenes As Solvent Acidity Sensors, Amy M. Green, Hannah R. Naughton, Zachariah B. Nealy, Robert D. Pike, Christopher J. Abelt
Arts & Sciences Articles
Derivatives of 2-propionyl-6-dimethylaminonaphthalene (PRODAN) with twisted carbonyl groups were investigated as highly responsive sensors of H-bond donating ability. The PRODAN derivative bearing a pivaloyl group (4) was prepared. The torsion angle between the carbonyl and naphthalene is 26° in the crystal. It shows solvatochromism that is similar to five other PRODAN derivatives (1–3, 5, 6). Twisted-carbonyl derivatives 3, 4, and 6 show strong fluorescence quenching in protic solvents. The order of magnitude of the quenching is linearly related to the H-bond donating ability of the solvent (SA) but not to other solvent properties. Binary mixtures of protic solvents show specific …
Structure And Bonding In Copper(I) Carbonyl And Cyanide Complexes, Robert D. Pike
Structure And Bonding In Copper(I) Carbonyl And Cyanide Complexes, Robert D. Pike
Arts & Sciences Articles
The coordination chemistry of copper(I) carbonyls and cyano complexes is reviewed. Primary attention is focused on structural chemistry, including coordination behavior, bridging modes, network formation, flexible coordination number, and reversible ligand binding. Additional coverage of infrared spectroscopy and orbital interactions in carbonyl and cyanide bonding and the photophysical behavior of metal cyano complexes is also included.
Synthesis And Properties Of Two Prodan-Based Fluorescent Models Of Cholesterol, Christopher J. Abelt
Synthesis And Properties Of Two Prodan-Based Fluorescent Models Of Cholesterol, Christopher J. Abelt
Arts & Sciences Articles
The syntheses and photophysical properties of 1-(5-methylhexyl)-2,3,7,8-tetrahydro-1H-naphtho[2,1-e]indo1-9(6H)-one (7a) and 1-(5-methylhexyl)-23,8,9-terrahydro-1H-naphrho[2,1-e]indol-6(7H)-one (7b) are reported. They are prepared in eight steps from the corresponding bromonaphthylamines. These fluorescent compounds have PRODAN-like cores, and they are structurally similar to cholesterol. Compound 7a is the first reported PRODAN derivative where both the amino and carbonyl groups are constrained to be coplanar with the naphthalene core. Comparing the photophysical behavior of these compounds with related compounds indicates that locking the amino group in a five-membered ring enhances their desirable properties as solvent polarity sensors. (C) 2012 Elsevier B.V. All rights reserved.
Dark Matter In The Heavens And At Colliders: Models And Constraints, Reinard Primulando
Dark Matter In The Heavens And At Colliders: Models And Constraints, Reinard Primulando
Dissertations, Theses, and Masters Projects
In this dissertation, we investigate various aspects of dark matter detection and model building. Motivated by the cosmic ray positron excess observed by PAMELA, we construct models of decaying dark matter to explain the excess. Specifically we present an explicit, TeV-scale model of decaying dark matter in which the approximate stability of the dark matter candidate is a consequence of a global symmetry that is broken only by instanton-induced operators generated by a non-Abelian dark gauge group. Alternatively, the decaying operator can arise as a Planck suppressed correction in a model with an Abelian discrete symmetry and vector-like states at …
Thermochemistry Of Amino Acids And Constrained Diamines, Erica Jane Tullo
Thermochemistry Of Amino Acids And Constrained Diamines, Erica Jane Tullo
Dissertations, Theses, and Masters Projects
The gas-phase proton affinities of several highly basic amino acids and diamines were determined using the extended kinetic method in an ESI-quadrupole ion trap instrument. The non-protein amino acid L-canavanine is structurally related to L-arginine with an oxygen substituted for the terminal methylene group of L-arginine and is highly toxic to humans. The proton affinity of L-arginine, a protein amino acid, was determined to be 1036 kJ mol -1, whereas the proton affinity of L-canavanine was determined to be 1005 kJ mol-1. Thus, substitution of an oxyguanidino group for the guanidine group in L-arginine results in a large decrease in …
Fluorescence Quenching Of Ppv-So And Bodipy-Naphthalene Systems, Brooklynd Dawn Saar
Fluorescence Quenching Of Ppv-So And Bodipy-Naphthalene Systems, Brooklynd Dawn Saar
Dissertations, Theses, and Masters Projects
No abstract provided.
Luminescent Nitrogen And Sulfure Adducts Of Cui Disubstituted Piperazine Complexes, Jason P. Safko
Luminescent Nitrogen And Sulfure Adducts Of Cui Disubstituted Piperazine Complexes, Jason P. Safko
Dissertations, Theses, and Masters Projects
No abstract provided.
Effects Of Nucleophile Strength On Selectivity In Bibr3 Catalyzed Cyclic Ether Construction, Ajara A. Rahman
Effects Of Nucleophile Strength On Selectivity In Bibr3 Catalyzed Cyclic Ether Construction, Ajara A. Rahman
Dissertations, Theses, and Masters Projects
No abstract provided.
The Role Of Small Carboxylic Acids During Poly(Amide) 11 Hydrolysis, John-Andrew Samuel Hocker
The Role Of Small Carboxylic Acids During Poly(Amide) 11 Hydrolysis, John-Andrew Samuel Hocker
Dissertations, Theses, and Masters Projects
No abstract provided.