John Polanyi
Nobel-winning chemist who pioneered infrared chemiluminescence in reaction dynamics.
John Charles Polanyi (born 23 January 1929) is a German-born Canadian chemist who shared the 1986 Nobel Prize in Chemistry for his work on chemical reaction dynamics. He was born in Berlin into the prominent Hungarian Polányi family; his father, Michael, was a chemist and philosopher, and his uncle, Karl, was an economic historian. The family emigrated to Britain in 1933 due to the persecution of Jews under Adolf Hitler. During World War II, at age eleven, Polanyi was sent to Canada for safety, attending the University of Toronto Schools. He returned to Britain, completed his education at the University of Manchester, earning a bachelor’s degree in 1949 and a PhD in 1952. His doctoral research, supervised by Ernest Warhurst, measured chemical bond strengths using thermal dissociation. After a postdoctoral fellowship at the National Research Council in Ottawa (1952–1954) working with Edgar William Richard Steacie and in Gerhard Herzberg’s spectroscopy lab, he spent two years as a research associate at Princeton University.
Polanyi joined the University of Toronto as a lecturer in 1956, becoming a full professor by 1962 and later University Professor Emeritus. His early research at Toronto, with graduate student Kenneth Cashion, led to discoveries about chemiluminescence from excited molecules, first published in 1958. His work focused on the mechanics of chemical reactions and the transition state. After encountering the 1986 Nobel laureates in physics, who developed scanning tunneling microscopy, Polanyi adopted this technology to observe chemical reactions at the molecular scale. His lab now uses four such microscopes. Beyond science, he is active in public policy, especially regarding nuclear weapons, and is considered one of “The Martians,” a group of prominent Hungarian scientists who emigrated in the early twentieth century. He has received numerous honors, including the Wolf Prize in Chemistry and 33 honorary degrees.
- field
- Chemistry
- nationality
- Canadian (German-born)
- known_for
- Infrared chemiluminescence, chemical reaction dynamics
Verified Timeline
Lore & Background
John Polanyi’s early research at the University of Manchester involved measuring chemical bond strengths through thermal dissociation, using a sodium flame apparatus to study collision probabilities in reactions. His subsequent work at the National Research Council in Canada led him to evaluate transition state theory, concluding it was flawed due to insufficient knowledge of forces in the transition state. While there, he also used spectroscopy in Gerhard Herzberg’s lab to examine vibrational and rotational excitation in iodine molecules. At Princeton, he was influenced by studies of vibrationally excited products from reactions between atomic hydrogen and ozone. After moving to the University of Toronto, his first graduate students sought enhanced reaction rates with vibrationally excited hydrogen and detected vibrationally excited hydrogen chloride during chlorine–hydrogen reactions. With graduate student Kenneth Cashion, Polanyi made early discoveries about chemiluminescence—light emitted by excited atoms or molecules—first published in 1958. Later, after encountering scanning tunneling microscopy at the 1986 Nobel ceremony, he adapted his methods to monitor chemical reactions at atomic scales, and his lab now uses four such microscopes. Outside science, Polanyi has been active in public policy discussions, particularly concerning nuclear weapons.
Reader's Guide
John Polanyi’s foundational contributions to chemical reaction dynamics were recognized with the 1986 Nobel Prize in Chemistry. His early research, conducted during his PhD at the University of Manchester, involved measuring chemical bond strengths through thermal dissociation. While at the National Research Council in Canada, he evaluated transition state theory and found it flawed due to insufficient knowledge of forces within the transition state. At Princeton, he was influenced by studies of vibrationally excited reaction products. After joining the University of Toronto in 1956, Polanyi and his graduate student Kenneth Cashion made their first discoveries regarding chemiluminescence—the light emitted by excited atoms or molecules—publishing this work in 1958. This infrared chemiluminescence technique enabled scientists to observe weak infrared emissions from newly formed molecules, revealing how energy is distributed during chemical reactions. Later in his career, after encountering the 1986 Nobel laureates in Physics, Polanyi adopted scanning tunneling microscopy to monitor chemical reactions at an atomic scale. His 2009 work on cooperative molecular dynamics in surface reactions, published in *Nature Chemistry*, has potential implications for nanotechnology. Beyond the laboratory, Polanyi has been active in public policy, particularly regarding science and nuclear weapons. He was identified by György Marx as one of "The Martians," a group of prominent Hungarian scientists who emigrated to the United States in the early 20th century.
Did You Know?
- Polanyi briefly considered a career as a poet after finishing high school.
- He was one of 'The Martians,' a group of prominent Hungarian scientists who emigrated to the United States in the first half of the 20th century.
- His Nobel medal is on display at Massey College at the University of Toronto.
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