Synthesis Of Tetrahydro-1,2-Oxazines And Pyrrolidines Via Cycloadditions Of Donor-Acceptor Cyclobutanes And Nitrosoarenes,
2015
Western University
Synthesis Of Tetrahydro-1,2-Oxazines And Pyrrolidines Via Cycloadditions Of Donor-Acceptor Cyclobutanes And Nitrosoarenes, Naresh Vemula, Brian L Pagenkopf
Chemistry Publications
During efforts to expand the scope of Lewis-acid-catalyzed [4+2] cycloaddition between donor–acceptor cyclobutanes and nitrosoarenes, an unexpected formation of pyrrolidine products was discovered when 50 mol-% of MgI2 was used as a Lewis acid. It was also observed that the electronics of the nitrosoarene and judicious selection of the Lewis acid catalyst have a profound effect on the regioselectivity of the reaction.
Catalytic Condensation Of Ketones With Carboxylic Acids,
2015
St. John Fisher University
Catalytic Condensation Of Ketones With Carboxylic Acids, Thomas Diprospero, Heni Patel, Alexey Ignatchenko
Chemistry Faculty/Staff Publications
It is found that use of acetone in place of acetic acid in the reaction with isobutyric acid is effective for the synthesis of the cross-ketonization product, methyl isopropyl ketone (MIPK). Rate of MIPK formation is of the same order of magnitude, but slightly lower for acetone compared to acetic acid under similar conditions (Fig. 1). The most active catalyst is KOH-treated titania. The second product of this reaction, DIPK, results from the ketonic decarboxylative condensation of isobutyric acid with itself. The 13C labeled carbonyl group from isobutyric acid is almost exclusively (within the detection error) transferred to the MIPK …
Polythiophene Nanocomposites For Photodegradation Applications: Past, Present And Future,
2015
Universiti Brunei Darussalaam
Polythiophene Nanocomposites For Photodegradation Applications: Past, Present And Future, Mohammad Mansoob Khan Dr, M. O. Ansari, S. A. Ansari, M. H. Cho
Dr. Mohammad Mansoob Khan
Polythiophene (PTh) has been the subject of considerable interest because of its good environmental stability, unique redox electrical behavior, stability in doped and neutral states, ease of synthesis, and wide range of applications in many fields. Apart from its applications in the electrical or electronic field, PTh has shown promising applications in photocatalytic degradation. The fabrication of a catalyst, metal oxides with PTh, extends the absorption range of the modified composite system, thereby enhancing the photocatalytic activity under UV or visible light irradiation. Substituted PTh, such as alkyl substitution, modifies the electronic properties of the polymer, thereby enlarging the potential …
Dissolved Organic Carbon Measurement Using A Modified High-Temperature Combustion Analyzer,
2015
University of South Carolina - Columbia
Dissolved Organic Carbon Measurement Using A Modified High-Temperature Combustion Analyzer, M. Peterson, Susan Lang, A. Aufdenkampe, J. Hedges
Susan Q. Lang
No abstract provided.
A Method To Measure The Isotopic (13C) Composition Of Dissolved Organic Carbon Using A High Temperature Combustion Instrument,
2015
University of South Carolina - Columbia
A Method To Measure The Isotopic (13C) Composition Of Dissolved Organic Carbon Using A High Temperature Combustion Instrument, Susan Lang, M. Lilley, J. Hedges
Susan Q. Lang
No abstract provided.
Investigating The Links Between Ozone And Organic Aerosol Chemistry In A Biomass Burning Plume From A Prescribed Fire In California Chaparral,
2015
Atmospheric and Environmental Research
Investigating The Links Between Ozone And Organic Aerosol Chemistry In A Biomass Burning Plume From A Prescribed Fire In California Chaparral, M. J. Alvarado, C. R. Lonsdale, Robert Yokelson, Sheryl Kashi Akagi, H. Coe, J. S. Craven, E. V. Fischer, G. R. Mcmeeking, J. H. Seinfeld, T. Soni, J. W. Taylor, D. R. Weise, C. E. Wold
Chemistry and Biochemistry Faculty Publications
Within minutes after emission, complex photochemistry in biomass burning smoke plumes can cause large changes in the concentrations of ozone (O3) and organic aerosol (OA). Being able to understand and simulate this rapid chemical evolution under a wide variety of conditions is a critical part of forecasting the impact of these fires on air quality, atmospheric composition, and climate. Here we use version 2.1 of the Aerosol Simulation Program (ASP) to simulate the evolution of O3 and secondary organic aerosol (SOA) within a young biomass burning smoke plume from the Williams prescribed fire in chaparral, which was sampled over …
Self-Assembled Monolayers And Methods For Using The Same In Biosensing Applications,
2015
University of Nebraska - Lincoln
Self-Assembled Monolayers And Methods For Using The Same In Biosensing Applications, Patrick H. Dussault, Rebecca Lai, Thomas J. Fisher, Anita J. Zaitouna
Patrick Dussault Publications
Cross-linked amphiphile constructs that form self-assembled monolayers (SAMs) on metal Surfaces such as gold Surfaces are disclosed. These new SAMs generate well packed and highly oriented monolayer films on gold Surfaces. A method for using the SAMs in the fabrication of biomolecule sensors is also disclosed.
Analytical Determination Of Copper Products,
2015
Selected Works
Analytical Determination Of Copper Products, Charles Dosh Smith
Charles Kay Smith
"It is a well known fact that the presence of impurities in copper products has been a source of annoyance to the Chemist. The object of this thesis was to make myself familiar with the actions of different impurities in copper products, and the methods for the determination of Arsenic in the same"--page 1.
Excited State Proton Transfer In 9-Aminoacridine Carboxamides In Water And In Dna ,
2015
Iowa State University
Excited State Proton Transfer In 9-Aminoacridine Carboxamides In Water And In Dna , Charles Andrew Smith
Charles Kay Smith
The 9-aminoacridine molecule is important in several different fields of chemistry. The absorption and fluorescence spectra of this compound are pH sensitive and it is this property that allowed it to be used as a pH probe in different chemical environments. The compound exhibits proton transfer reactions which are among the most fundamental of chemical reactions. The planarity of 9-aminoacridine allows it to intercalate into DNA. Intercalation is a process in which the aromatic flat surface of the intercalator inserts between adjacent base pairs of DNA The large surface area of 9-aminoacridine's fused tricyclic ring system allows strong intercalative binding …
Zno/Cdo Nanocomposites For Textile Effluent Degradation And Electrochemical Detection,
2015
Universiti Brunei Darussalaam
Zno/Cdo Nanocomposites For Textile Effluent Degradation And Electrochemical Detection, Mohammad Mansoob Khan Dr
Dr. Mohammad Mansoob Khan
In this report, the photocatalytic and electrochemical activity of ZnO and ZnO/CdO nanocomposites were determined. Pure ZnO and nanocomposite ZnO/CdO were prepared by a vapor to solid mechanism and were characterized by different physical and chemical techniques. The CdO-modified ZnO possessed high efficiency to degrade textile effluent. It also showed high efficiency of degradation, such as 98% for methylene blue and 93% for methyl orange. Cadmium oxide (impurity) plays an important role in achieving zinc oxide materials that exhibit UV to visible light degradation of textile effluent. Additionally, uric acid sensing performed to study the electrochemical activity revealed that ZnO/CdO …
Strain Promoted Click Chemistry Of 8-Azidopurine And 5-Azidopyrimidine Nucleosides And Nucleotides With Cyclooctynes And Applications To Living Cell Imaging,
2015
Florida International University
Strain Promoted Click Chemistry Of 8-Azidopurine And 5-Azidopyrimidine Nucleosides And Nucleotides With Cyclooctynes And Applications To Living Cell Imaging, Jessica Zayas
FIU Electronic Theses and Dissertations
The strain promoted azide alkyne cycloaddition (SPAAC) of azido nucleobase modified nucleosides and nucleotides with cyclooctynes to give fluorescent triazoles has been relatively unexplored. Thus, SPAAC between azido-nucleobases and various cyclooctynes in aqueous solution at ambient temperature resulted in the efficient formation (3 min - 2 h) of triazole products with inherent fluorescent properties. The 2- and 8-azidoadenine nucleosides reacted with fused cyclopropyl cyclooctyne, dibenzylcyclooctyne or monofluorocyclooctyne to produce click products functionalized with hydroxyl, amino, N-hydroxysuccinimide, or biotin moieties. The previously unexplored 5-azidouridine and labile 5-azido-2'-deoxyuridine were similarly converted to the analogous triazole products in quantitative yields in less …
Silver Nanoparticles And Defect-Induced Visible Light Photocatalytic And Photoelectrochemical Performance Of Ag@M-Tio2 Nanocomposite,
2015
Universiti Brunei Darussalaam
Silver Nanoparticles And Defect-Induced Visible Light Photocatalytic And Photoelectrochemical Performance Of Ag@M-Tio2 Nanocomposite, Mohammad Mansoob Khan Dr, S. A. Ansari, M. O. Ansari, M. H. Cho
Dr. Mohammad Mansoob Khan
An electrochemically active biofilm-assisted visible light active Ag@m-TiO2 photocatalyst was fabricated. The resulting nanocomposite was characterized by X-ray diffraction, transmission electron microscopy, diffuse absorbance/reflectance spectroscopy, photoluminescence spectroscopy, and X-ray photoelectron spectroscopy. The photocatalyst showed high photocatalytic activity and photoelectrochemical behavior due to the synergistic effect of the surface plasmon resonance (SPR) of Ag nanoparticles (AgNPs) and the induced defects in TiO2 (m-TiO2) nanoparticles. Ag@m-TiO2 nanocomposite showed much higher light harvesting ability because of the reduced band gap of m-TiO2 as well as the SPR characteristics of the AgNPs. The visible light photocatalytic experiments showed that the Ag@m-TiO2 nanocomposite possessed excellent …
An Approach To An Agave Problem: The Bioremediation Of Agricultural Waste By Yeast Fermentations,
2015
Illinois State University
An Approach To An Agave Problem: The Bioremediation Of Agricultural Waste By Yeast Fermentations, Joshua Michael Jarodsky
Theses and Dissertations
The agricultural waste products created by industries, such as the Tequila manufacturing industry, create thousands of tons of waste material every year. This agricultural waste often becomes an environmental and ecological problem for fields and surrounding areas. The purpose of this study is to determine the potential of using the yeast Kluyveromyces marxianus 7-1 and Kluyveromyces marxianus 8-1 to ferment the leaf waste from the harvesting of the Agave tequilana as a form of bioremediation. Fermentations (anaerobic, under constant shaking, and at room temperature) were monitored for colony forming units, pH of fermentation broth, concentration of reducing sugars, and protein …
Kinetic Study Of The Oxygen Reduction Reaction On Α-Ni(Oh)2 And Α-Ni(Oh)2 Supported On Graphene Oxide,
2015
CUNY New York City College of Technology
Kinetic Study Of The Oxygen Reduction Reaction On Α-Ni(Oh)2 And Α-Ni(Oh)2 Supported On Graphene Oxide, Elaheh Farjami, L. Jay Deiner
Publications and Research
The kinetics of the oxygen reduction reaction on α-Ni(OH)2 and α-Ni(OH)2 supported on graphene oxide (α-Ni(OH)2/GO) were investigated using rotating disk linear sweep voltammetry in alkaline solutions of varying oxygen and hydroxyl concentrations. Over the full hydroxyl concentration range (0.05 M to 0.5M), α-Ni(OH)2/GO displayed higher activity than unsupported α-Ni(OH)2. The electron transfer numbers were 2.9 ± 0.2 for α-Ni(OH)2, 3.4 ± 0.1 for α-Ni(OH)2/GO at low [OH−], and 3.8–3.9 for α-Ni(OH)2/GO at high [OH−]. Compared to α-Ni(OH)2, α-Ni(OH)2/GO displayed higher chemical reaction rate constants and higher electron transfer rate constants. These differences suggest that the synergy between the α-Ni(OH)2 …
Low-Voltage Polymer/Small-Molecule Blend Organic Thin-Film Transistors And Circuits Fabricated Via Spray Deposition,
2015
Imperial College London, UK
Low-Voltage Polymer/Small-Molecule Blend Organic Thin-Film Transistors And Circuits Fabricated Via Spray Deposition, Simon Hunter, Jeremy W. Ward, Marcia M. Payne, John E. Anthony, Oana D. Jurchescu, Thomas D. Anthopoulos
Chemistry Faculty Publications
Organic thin-film electronics have long been considered an enticing candidate in achieving high-throughput manufacturing of low-power ubiquitous electronics. However, to achieve this goal, more work is required to reduce operating voltages and develop suitable mass-manufacture techniques. Here, we demonstrate low-voltage spray-cast organic thin-film transistors based on a semiconductor blend of 2,8-difluoro- 5,11-bis (triethylsilylethynyl) anthradithiophene and poly(triarylamine). Both semiconductor and dielectric films are deposited via successive spray deposition in ambient conditions (air with 40%–60% relative humidity) without any special precautions. Despite the simplicity of the deposition method, p-channel transistors with hole mobilities of >1 cm2/Vs are realized at −4 …
Cross-Selectivity In The Catalytic Ketonization Of Carboxylic Acids,
2015
St. John Fisher University
Cross-Selectivity In The Catalytic Ketonization Of Carboxylic Acids, Alexey Ignatchenko, Joseph Deraddo, Vincent Marino, Adam Mercado
Chemistry Faculty/Staff Publications
A mixture of acetic and 2-methylpropanoic (isobutyric) acids representing non-branched and branched acids, respectively, was catalytically converted to a mixture of ketones in a set of statistically designed experiments (DOE). The selectivity toward the cross-ketonization product was analyzed depending on (a) temperature within 300–450 °C range, (b) molar fraction of each acid in the mixture, from 10% to 90%, and (c) liquid hourly space velocity (LHSV) within 2–12 h−1, and compared against the selectivity toward two symmetrical ketones. Six metal oxide catalysts were tested and ranked on their ability to yield the cross-product as opposed to the self-condensation …
Black Carbon: Sources, Mobility And Fate In Freshwater Systems,
2015
Florida International University
Black Carbon: Sources, Mobility And Fate In Freshwater Systems, Sasha Wagner
FIU Electronic Theses and Dissertations
Black carbon (BC) is a complex mixture of polycondensed aromatic compounds produced by the incomplete combustion of biomass during events such as wildfires and the burning of fossil fuels. Black carbon was initially considered to be a refractory form of organic matter. However, recent studies have shown that BC can be quite mobile and reactive in the terrestrial environment. Black carbon can be translocated from soils and sediments in the form of dissolved BC (DBC). A global correlation between DBC and bulk dissolved organic carbon (DOC) has been established for fluvial systems where DBC comprises approximately 10% of the total …
Fast And Sensitive Genome-Hashing Software And Its Application In Using Ngs As A Detection Agent For Bacterial Presence In Oral Metagenomic Samples,
2015
University of Missouri-St. Louis
Fast And Sensitive Genome-Hashing Software And Its Application In Using Ngs As A Detection Agent For Bacterial Presence In Oral Metagenomic Samples, Paul Michael Gontarz
Dissertations
Next generation sequencing has increased the throughput of sequenced DNA into the range of billions of nucleotides sequenced per day. With the increased speed of DNA sequencing and the short length of reads produced by next generation sequencers, a significant challenge has been created in quickly and accurately assembling the hundreds of millions of short reads created by modern sequencing instruments into their full genomic sequences. With the increase in throughput in next generation sequencing and the decrease in time and cost to perform DNA sequencing, novel applications for DNA sequencing are being considered. Among them is a methodology by …
Mechanism Analysis Of Copper (Ii) Ions Interacting With Dimethylaminocyanostilbene,
2015
Andrews University
Mechanism Analysis Of Copper (Ii) Ions Interacting With Dimethylaminocyanostilbene, Eui Bin You, Ryan T. Hayes Ph.D.
Posters, Presentations, and Papers
Previous research has suggested that the fluorescence of dimethylaminocyanostilbene (DCS) is selectively quenched by copper(II) ions.1 This study aimed to elucidate the fluorescence quenching mechanism and to explore its potential application to screen for copper ions in water samples. A spectroscopic Job Plot analysis was used to determine the stoichiometric ratio of DCS–copper(II) ion binding.2 Additionally, DCS was mixed with various buffered metal ion solutions and tested in different pH environments to reveal any ion-dependent and/or pH-dependent fluorescence response. Nuclear magnetic resonance spectroscopy (NMR) analysis of DCS mixed with various amounts of buffered copper(II) solution was also performed …
Neutron Scattering At The Intersection Of Heart Health Science And Biophysics,
2015
Universitat Graz
Neutron Scattering At The Intersection Of Heart Health Science And Biophysics, Drew Marquardt, Richard J. Alsop, Maikel C. Rheinstädter, Thad A. Harroun
Chemistry and Biochemistry Publications
There is an urgent quest for improved heart health. Here, we review how neutron radiation can provide insight into the molecular basis of heart health. Lower cholesterol, a daily intake of aspirin and supplemental vitamin E are argued to all improve heart health. However, the mechanisms behind these common regimens, and others, are not entirely understood. It is not clear why a daily intake of aspirin can help some people with heart disease, and the benefits of vitamin E in the treatment of reperfusion injury have been heavily debated. The molecular impact of cholesterol in the body is still a …
