Chemistry Research

Analytical Chemistry: Spacecraft Batteries

with Dr. Richard Whiteley

Dr. Whiteley is actively involved in the design and development of spacecraft batteries, especially nickel-hydrogen cells. This has included technical consulting for the Hubble Space Telescope and Space Station Freedom programs. He is a contributing author to NASA's handbook for Nickel-Cadmium battery cell analysis.

Recent Presentations and Publications

"Acid/Base Equilibrium in General Chemistry Using Maple" Maple Summer Workshop, Waterloo, Ontario, Canada, July 2004

"Characterization of Lithium Battery Electrolytes by Computer Modeling" B.K. Moore, R.V. Whiteley, Jr., K.E. Johnson, and J.O. Currie, Jr., 2000 NASA Aerospace Battery Workshop, 14-16 Nov. 2000, Marshall Space Flight Center, Huntsville, AL

C.O. Kelly and R.V. Whiteley, Jr. "Recent Developments in Cathode Material Preparation and Characterization for Rechargeable Lithium Ion Batteries," Proceedings of the 37th Power Sources Conference, 17-20 June 1996, pp195-199.

"Low Temperature Synthesis, Chemical and Electrochemical Characterization of LiNixCo1-xO2 Cathode Materials for Rechargeable Lithium Ion Batteries" K.S. Nanjundaswamy, D. Standlee, C.O. Kelly, and R.V. Whiteley, Jr., 1996 NASA Aerospace Battery Workshop, 5 Dec. 1996, Marshall Space Flight Center, Huntsville, AL.

Biochemistry: Protein Structure-Function Relationships

with Dr. Jeannine Chan

Dr. Chan's research interests lie in the area of protein structure - function relationships of metalloenzymes. Studies in her lab focus on the bacterial enzymes of the global nitrogen cycle, the ecology of which can have substantial impacts to both agricultural productivity and water quality. Specifically, she is investigating the mechanism of the Mo-nitrogenase, which catalyzes biological nitrogen fixation (N2 to NH3), and the biosynthesis of nitrous oxide reductase, a copper-containing enzyme which catalyzes the last step of the denitrification pathway (N2O to N2).

Recent Presentations and Publications

Chan, J. M., Bollinger, J. A., Grewell, C. L., Dooley, D. M. (2004) Reductively activated nitrous oxide reductase reacts directly with substrate. J. Am. Chem. Soc. 126, 3030-3031.

Sorlie, M., Chan, J. M., Wang, H., Seefeldt, L. C., Parker, V. D. (2003) Elucidating thermodynamic parameters for electron transfer proteins using isothermal titration calorimetry: Application to the nitrogenase Fe protein. J. Biol. Inorg. Chem. 8, 560-566.

Chan, J. M., Wu, W., Dean, D. R., and Seefeldt, L. C. (2000) Construction and characterization of a heterodimeric Fe protein: Defining roles for ATP in nitrogenase catalysis. Biochemistry 39, 7221-7228.

Christiansen, J., Chan, J. M., Seefeldt, L. C., and Dean, D. R. (2000) The role of the MoFe protein a-125Phe and beta-125Phe residues in Azotobacter vinelandii MoFe protein-Fe protein interaction. J. Inorg. Biochem. 80, 195-204.

Chan, J. M., Christiansen, J., Dean, D. R., and Seefeldt, L. C. (1999) Spectroscopic evidence for changes in the redox state of the nitrogenase P-cluster during turnover. Biochemistry 34, 5779-5785.

Chan, J. M., Ryle, M. J., and Seefeldt, L. C. (1999) Evidence that MgATP accelerates primary electron transfer in a Clostridium pasteurianum Fe protein-Azotobacter vinelandii MoFe protein nitrogenase tight complex. J. Biol. Chem. 274, 17593-17598.

Inorganic Chemistry: Synthesis of Biomimetic Polymers

with Dr. Joel Gohdes

Students working with Dr. Gohdes are trying to develop metal containing polymers that mimic the reactivity of naturally occurring proteins and enzymes. One of our initial targets, hemocyanin, is a copper containing protein responsible for oxygen transport in mollusks. Our approach entails synthesizing copper containing molecules that are then embedded in polymers. We follow the reactivity by monitoring the UV-vis spectrum as we expose these materials to different conditions. To the right is the structure of a hydroxide-bridged, copper dimer synthesized for this project.

Recent Presentations and Publications

"The synthesis and catalytic activity of a novel iron(II) molecularly imprinted polymer," Adam Glass and Joel Gohdes, Inorganic Poster session, 231st National American Chemical Society Meeting, Atlanta, GA, March 2006

"Complexes covalently bound to silica surfaces: a new approach to a dioxygen-binding catalyst," Erik Yukl and Joel Gohdes, 229st National American Chemical Society Meeting, San Diego, CA, March 2005

"Synthesis and dioxygen reactivity of a copper-containing polymer," Justin Crossland and Joel Gohdes, 227st National American Chemical Society Meeting, Anaheim, CA, March 2004

Disalvo, D.; Dellinger, D.B.; and Gohdes, J.W. "Catalytic Epoxidations of Styrene Using a Manganese Functionalized Polymer" Reactive and Functional Polymers, 53(2-3), 2002, 103-112.

Joel W. Gohdes, Brandy L. Duran, Noline C. Clark, Thomas W. Robison, Barbara F. Smith, and Nancy N. Sauer.,"Synthesis and Metal Binding properties of Novel Sulfur-Containing Water Soluble Polymers" Separation Science and Technology, 36(12), 2001, 2647-2658.

Physical Chemistry: Surface Chemistry Research: Spectroscopy and microscopy of liquid/solid interfaces

with Dr. Kevin E. Johnson

Students in Dr. Johnson's laboratory participate in research that investigates the molecular structure at the interface between solids and liquids. At an interface the structure of both the solid and liquid differ from that in the bulk material. The study of interfacial structure has bearing on the understanding of electrode surfaces, solid-state sensors, as well as cell surfaces in biological chemistry.

Student researchers will employ two techniques to study molecules at interfaces. Scanning tunneling microscopy (STM) and atomic force microscopy (AFM) are both scanning probe microscopy techniques that allow for the imaging of molecular structure of surfaces in situ. It is also possible to measure the molecularvibrations at interfaces using infrared reflection absorption spectroscopy (IRRAS) and surface enhanced Raman spectroscopy (SERS).

The surfaces studied are Self-Assembled Monolayers (SAMs); that is a single molecular layer on a well defined metal surface.

Recent Presentations

Kevin E. Johnson "Projects in General Chemistry Activity Sessions: Putting Theory into Practice" Presented at The 16th Biennial Conference on Chemical Education in Ann Arbor, Michigan, 31 July 2000.

Kevin E. Johnson "Electrolyte influence on lithium-ion batteries: SEI formation, damage to graphite electrodes, and the semi-empirical ethylene carbonate reduction pathway" Poster Presented at The Sigma Xi Forum and Annual Meeting in Raleigh, NC, 8-11 November 2002.

Kevin E. Johnson "Electrolyte influence on lithium-ion batteries: SEI formation, damage to graphite electrodes, and the semi-empirical ethylene carbonate reduction pathway" Poster presented at The Gordon Conference on Electrochemistry in Ventura, CA, 20-25 January 2003.

Kevin E. Johnson "Surface vibrational spectroscopy of nonaqueous electrolytes under potential control" Poster presented at The National American Chemical Society Meeting in Orlando, FL, 7-10 ASpril 2002.

Kevin E. Johnson "Implementation of model research projects in the general chemistry laboratory" Presented at The 17th Biennial Conference on Chemical Education in Bellingham, Washington, 29 July 2002.

Natural Products Synthesis as well as Structure - Activity Relationship (SAR) Studies of Antioxidant Agents

with Dr. Roxana Ciochina

The main focus of our research is synthesis of natural products with interesting biological properties. Laurenditerpenol is a natural product that potentially inhibits HIF - 1, a key factor in cancer progression. We try to synthesize laurenditerpenol by using the Diels - Alder reaction in the key steps of the synthesis. Students will have the chance to explore a wide variety of organic reactions, almost all studied in their sophomore courses, with a main focus on the Diels - Alder reaction.

Our group also developed a series of curcumin derivatives and is currently looking into their antioxidant properties as well as antimicrobial, anti-inflammatory, and carcinogenic properties. Some curcumin derivatives showed a strong fluorescence and we have already started looking into their optical properties and their potential uses as fluorescent dyes in biomedical research.