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5 Questions With . . . Pete Pringle on 44 Years in the Chemistry Department

Professor of Chemistry Wallace "Pete" Pringle (standing) celebrates his retirement from Wesleyan with his graduate research group. The students, pictured, from left, are Daniel Obenchain, Brittany Long, Daniel Frohman, and Andrea Minei, Ph.D. '09.

Q: Professor Pringle, you joined Wesleyan’s Chemistry Department as an assistant professor in 1968. How have times changed?

A: I started here before there were female students. Wesleyan had NO COMPUTER at all, and Ph.D. programs were just starting. At the time, we had 11 faculty in the department: Al Fry, Gill Burford, John Sease, Jose Gomez-Ibanez, Peter Leermakers, Julia Tan, Don Sebera and Larry Faller were here, and two faculty came here when I did–Paul Haake from UCLA and Peter Wharton from Wisconsin. Of this group, Al Fry is the only one still working in the department. The department had just moved out of Hall Chemistry Labs, a building that had columns that juxtaposed Olin. The Science Library is there now. Ted Etherington was president and many faculty smoked pipes during faculty meetings. All wore coats and ties and there were very few women faculty. The chemistry department nowadays is slightly larger than in 1967-68, and has grown in theoretical, inorganic, biochemistry and spectroscopy. There are many high-field NMR spectrometers also. I was the first occupant of my brand new office in Hall-Atwater and I am still there.

Wallace "Pete" Pringle, professor of chemistry, retired this May after a 44-year tenure at Wesleyan. (Photos by Roslyn Carrier-Brault)

Q: What are you research interests?

A: My research group, which was comprised of 60 undergraduate and 16 graduate students, worked on far-infrared spectroscopy on ring molecules such as diboranes and collision induced rotation-translation spectroscopy between nonpolar molecules. The kinetics of the reactions of trace specific cogeners of polychloro-biphenyls- or PCBs – in water. PCBs became ubiquitous in the environment and they are concentrated up the food chain and have health consequences. One way they can be destroyed is by oxidation–so we studied that. Much of my other studies have been on the forces that cause gas phase molecules to turn into liquids. The small forces between molecules that lead to liquids are poorly understood–so we study that.

Q: What was your biggest research accomplishment?

A: My lab confirmed the existence of a 50-year-old prediction of a ring puckering vibration in diboranes. Diborane is a very peculiarly bonded small-ring molecule that ignites spontaneously in wet air. Our lab showed that the rate of oxidation of PCBs was a function of the number of chlorines in the molecule and was independent of the positions of substitution. PCBs are molecules that have one or more chlorine molecules placed on two bonded benzene rings. These liquids do not burn or decompose and were added to the oil in electric company transformers to keep the transformers from exploding and burning as they did before PCBs were discovered by chemists. They were so stable that they accumulated in the environment; however they save many, many lives by keeping transformers from exploding and burning near schools, hospitals and buildings in cities.