Chemistry Commons^™

Theoretical And Spectroscopic Analysis Of Ch...Π Interactions Of Fluorinated Aromatic Systems, Anuradha Gayathri Akmeemana

Masters Theses

CH...π interactions are non-covalent interactions which occur in organic compounds that are important in biological and chemical sciences in many ways. Microwave spectroscopy is an important technique that can be used to detect CH...π interactions in the gas phase molecules. Previously microwave spectroscopic studies of complexes containing CH...π interactions, benzene...HCCH (Ulrich, N.W.; Seifert, N.A.; Dorris, R.E.; Peebles, R.A.; Pate, B.H.; Peebles, S.A., Phys. Chem. Chem. Phys. 2014, 16, 8886-8894) and fluorobenzene...HCCH (Ulrich, N.W.; Songer, T.S.; Peebles, R.A.; Peebles, S.A.; Seifert, N.A.; Perez, C.; Pate, B.H. Phys. Chem. Chem. Phys., 2013, 15, 18148-18154) were done at Eastern Illinois University and the …

Investigations Towards Synthesis Of Cinnamaldehyde Semicarbazone Derivatives And Their Photochromicity By Modifying The Ring, The Linker, And The Semicarbazone, Xiao Xiao

Masters Theses

Cinnamaldehyde semicarbazone was varied in three ways, by altering the ring, the conjugated linker, and the semicarbazone, to investigate how changing the structure affects the photochomicity. The synthesis of 7 hetero- and 2 polycyclic- aromatic semicarbazone variants involved three steps, (a Wittig reaction, hydrolysis, and condensation to the semicarbazone) with cumulative yields of 15% to 52%. Generally, the pyridine series gave lower yields than other synthesized semicarbazones. The Wittig reaction gave cis/trans mixtures in ratios of 2 : 1 to 1 : 7 for the 6 acetals, except for the 3 that went directly to the aldehyde, due to the …

Computational And Experimental Studies Of Non-Covalent Interactions: Characterization Of Ch...Π Interactions And Structure Of 1,1-Difluoroethylene...Carbon Dioxide, Ashley M. Anderton

Masters Theses

Weakly bound CH/π interactions, due to the abundance of C-H bonds and π systems that exist in larger organic molecules, are an important driving force in the construction of biomacromolecules, supramolecular assemblies and crystal packing of organic compounds. To assist in the characterization of CH/π interactions, a density functional theory (DFT) study has been conducted to determine a quick and cheap method for accurate determination of the binding energy and rotational constants for CH/π interactions. Seven complexes were used in this study: five benzene-HY complexes (where Y= C≡CH, Cl, F, Br and C≡N) and two fluorobenzene-HY complexes (where Y= C≡CH …

Synthesis And Characterization Of Molecular Components For The Preparation Of Poly-Rotaxanes, Austin P. Welti

Masters Theses

The self-sorting ability of certain crown ethers make them important players in the field of supramolecular chemistry, especially those studying mechanically interlocked molecules (MIMs). Of these MIMs, rotaxanes and catenanes are the most common. Our approach in the synthesis of poly-rotaxane systems involves the preparation of axles containing multiple recognition motifs to determine the self-sorting principles that each motif shows. These principles include narcissistic self-sorting, and also type I and type II social self-sorting principles. Using these techniques, poly-rotaxane formation can be made readily available.

A hetero-poly-rotaxane equipped with a naphthalene diimide (NDI) site and two ammonium salt sites has …

Chemical Transformations Of Arylsulfonamide Molecular Crystals, Rajan Giri

Masters Theses

The pursuit of chemical specificity and efficiency of chemical reaction in molecular crystals has attracted considerable attention over the last decade. The successful control of molecular alignment prior to such transformations continues to provide opportunities for near quantitative yields of new materials. This thesis reports the predictable self-assembly of aryl sulfonamide materials constructed from cinnamic acid and phenylpentadienoic acid fragments capable of forming supramolecular dimers that undergo unique photocyclization reactions. Use of racemic and enantiopure single-component building-blocks provides access to enantiocontrolled [2+2] photodimerized products.

Solid-state reaction precursors were prepared using conventional solution-based synthetic organic techniques. Component chirality (racemic or homochiral) …

Studies Of The Structural Boundaries Of Solid-State Photodimerization Reactions Via Isocoumarins And Heteromeric Assemblies, Mihiri S. Weerasinghe

Masters Theses

The study of molecules in crystals has gained considerable attention in the field of structural chemistry. Much interest has focused on the use of molecular crystals for the construction of materials with specific functional properties. Because the design of such materials requires a critical understanding of intermolecular interactions, use of the building-block approach continues to offer an important strategy to multimolecular frameworks. Though the use of template and metal-ligand interactions has provided successful opportunities to organize chemical reactions in solids, these methods require secondary molecules and are limited to achiral starting materials. As such, exploring chiral synthesis with simplified precursors …

Determination Of Structural Stabilities Of Metal-Free Porphyrin Cytochrome C, Zinc Cytochrome C, And Cobalt Cytochrome C, Usha K. Tottempudi

Masters Theses

No abstract provided.

Crystal Structures Of Metal Sulfonates, Jon Lyle Obrecht

Masters Theses

Designing new materials with predictable chemical and physical properties has long been a goal of synthetic chemists. The functional properties of molecular compounds are intimately tied to the underlying chemical framework. In addition to atom selection and chemical connectivity, the spatial organization of the molecules often contributes to the function of materials. Because crystals are constructed of periodic arrays of components (i.e. atoms or molecules) with structures easily assessed via X-ray diffraction, crystalline materials offer ideal candidates to explore the relationship of component selection and crystal packing to material property.

One such property that has been extensively examined by …

From Half-Rotaxanes To Poly-Rotaxane Architectures, Heather Renee Schoonover

Masters Theses

The host-guest abilities of macrocyclic compounds made them important players in the field of supramolecular chemistry, especially those studying mechanical bonds. Rotaxanes and catenanes are among the most well-known examples of mechanically interlocked molecules. Our approach in the synthesis of poly-rotaxane systems involves the preparation of pseudorotaxanes with donor capabilities and then use metallic centers to assemble the poly-rotaxane architectures.

A pyridine-based half-rotaxane has been synthesized and the subsequent solution studies revealed a large association constant. ¹H-NMR studies show that these interlocked species exhibit a slow exchange on the NMR timescale. Using the single point method and VT-NMR several …

The Effect Of Electrochemical Modification On The Surface Topography And Chemical Make-Up Of Strontium Titanate, Kelly J. Harmon

Masters Theses

Previous research into the oxidation and reduction of strontium titanate and the changes that result from this has been carried out. The oxidation and reduction of strontium titanate at high temperatures and high pressures has been investigated for the effect that it has upon the surface topography of strontium titanate and the chemical makeup of the strontium titanate. Research into the electrochemical oxidation of perovskites, similar in structure to that of strontium titanate, have even provided evidence pointing to the identity of the oxygen species being incorporated into the strontium titanate.

This research seeks to investigate what changes occur to …

The Effects Of Chemical Treatment And Light Exposure On Pah Concentrations In Biochar, Fathima Nadheesha Muhammed Khalid

Masters Theses

A series of experiments quantifying extractable polycyclic aromatic hydrocarbons (PAHs) in biochar before and after various treatments were conducted. The analytical approach included solvent extraction of PAHs with toluene, further isolation and column cleanup before gas chromatography mass spectroscopy (GC-MS) analysis. The treatment methods include exposing biochar samples to sunlight and UV radiation with and without additives and reacting with hydrogen peroxide.

Two biochar samples from the Eastern Illinois University bench-type gasifier and commercial biochar were analyzed. Analyzing of three biochar types revealed that plant biochar has lower total PAH concentration than wood (W) biochar or wood and plant (giant …

Simultaneous Electrochemical Determination Of Tryptamine And Barbituric Acid, Luxshani Thangarajah

Masters Theses

No abstract provided.

Dibenzimidazolium Salts And Their Interactions With 1,5-Dinaphtho-38-Crown-10, David B. Bernthal

Masters Theses

The use of imidazolium salts in mechanically interlocked molecules, like pseudorotaxanes, is of interest because they can be functionalized with side arms that allow for coordination chemistry. It has been previously shown that tetraakylbenzobisimidazolium salts successfully thread through crown ethers, such as 15DN38C10 or BPP34C10, to form pseudorotaxanes. As an extension of the results that were gathered about this novel template, it was our goal to explore the degree to which larger imidazolium salts interact with such crown ethers. This research focused on the interactions between 15DN38C10 and dibenzimidazolium cations that were tetra-substituted with methyl groups, butyl groups, and benzyl …

Ruthenium Polypyridyl Complexes That Utilize Azo-Dyes To Enhance Absorption Of Visible Photons, Akram Hazeen

Masters Theses

No abstract provided.

Utilization Of Phosphorus Ylides Towards The Synthesis Of Extended Cinnamaldehydes And Stellettins, John M. Saathoff

Masters Theses

No abstract provided.

Internal Motion In Weakly Bound Halomethane Complexes, Amelia J. Thomas

Masters Theses

No abstract provided.

Educational Technology: Podcasts, Vodcasts, And Blogs In The Science Classroom, Danielle N. Thompson

Masters Theses

No abstract provided.

Electrochemical Characterization Of Thin-Film Perovskite-Type La1-Xsrxmno3 Electrodes Obtained By Pulsed Laser Deposition (Pld), Keerthi Chandra

Masters Theses

The implementation of fuel cells into commercial usage is prenominally dependent on the activity of cathode at which oxygen reduction reaction (ORR) takes place. Fuel cells currently use noble metals like platinum, palladium etc as cathode for the reduction reaction. These metals showed poor performance during changes in red ox environment. Perovskite oxides which were proven to be efficient as cathodes in solid oxide fuel cells operating at high temperature was studied to understand its ability to carry out ORR in alkaline fuel cells operating at room temperature.

La_1-XSr_xMnO₃ (LSMO), thin film perovskite oxide, a …

Exploring Phenyl Embrace Interactions In Trityloxy And Tritylamino Aromatic Compounds, Premnath Basa

Masters Theses

The area of supramolecular chemistry seeks to understand the organization of molecular structures and the interactions that hold such assemblies together by non-covalent interactions such as electrostatic, hydrogen bonding, π-π stacking interactions, and hydrophobic or solvatophobic effects. One such example that comes under supramolecular chemistry is the phenyl embrace interaction. These interactions occur due to the cooperative participation of at least three or more neighboring phenyl groups arranged as an interlocking propeller configuration to give complementary edge-to-face or offset face-to-face interactions. In order to understand the effect of functional groups on the tendencies of organic compounds to form phenyl embrace …

Method Developments To Analyze Caffeine And Acesulfame-K Concentrations In Natural Waters In And Around Charleston, Il, Usa, Laleen Bodhipaksha

Masters Theses

No abstract provided.

Structural And Photochemical Behavior Of Phenyl And Dihydrophenyl Sulfonamidecinnamic Acids, Sergey Zinovchik

Masters Theses

No abstract provided.

The Effect Of Surface Hydrophobicity On Wind Erosion Probed By Atomic Force Microscopy, Bradley Eric Frost

Masters Theses

No abstract provided.

The Affect Of Surface Hydrophobicity On Wind Erosion Probed By Atomic Force Microscopy, Bradley Eric Frost

Masters Theses

No abstract provided.

Catalytic Activity Of Titania And Titania-Containing Nanomaterials: And, Spatial Distribution Of Silica Surface Groups Using A Tethered Amine Catalyst, Ramkumar Samala

Masters Theses

No abstract provided.

Synthesis Of Molecular Containers Based On Modifications Of Resorcin(4)Arene And Calix(4)Arene, Anupama Makineni

Masters Theses

No abstract provided.

Degradation Of Organic Matter In Water In The Presence Of Catalyst And Uv Radiation, Bimali Bandaranayake

Masters Theses

No abstract provided.

Nanoporous High Surface Area Silicas With Chelating Groups For Heavy Metal Ion Adsorption From Aqueous Solution, Kothalawalage Nuwan Kothalawala

Masters Theses

No abstract provided.

Ditopic Dithiophosphonates And Their Related Rotaxanes, Robert Ray Baum Jr.

Masters Theses

No abstract provided.

Stability Of Heme Proteins: Cytochrome C And Horseradish Peroxidase, Mini Gupta

Masters Theses

No abstract provided.

Cloning, Overexpression, Purification And Characterization Of Gcp Ii Homologous Metalloprotein From Caulobacter Crescentus, Dilani Nilushika Gigiriwala Gamage

Masters Theses

No abstract provided.