Louis Plack Hammett

Louis Plack Hammett
Born 7 April 1894
Died 9 February 1987 (1987-02-10) (aged 92)
Alma mater Columbia University (Ph.D)
Known for Hammett equation
Awards Priestley Medal (1961)
Willard Gibbs Award (1961)
National Medal of Science (1967)
Barnard Medal for Meritorious Service to Science (1975)
Scientific career
Fields Physical Chemistry

Louis Plack Hammett (April 7, 1894 February 9, 1987) was an American physical chemist. He is known for the Hammett equation, which relates reaction rates to equilibrium constants for certain classes of organic reactions involving substituted aromatic compounds. He is also known for his research into superacids and his development of a scheme for comparing their acidities based on what is now known as the Hammett acidity function. The Curtin–Hammett principle bears his name.

The awards he obtained included the Priestley Medal in 1961,the Willard Gibbs Award in 1961,[1] the National Medal of Science in 1967, and in 1975 the Barnard Medal for Meritorious Service to Science.

Hammett grew up in Portland, Maine, and studied in Harvard and Switzerland. He earned his Ph.D. at Columbia University. He authored an influential textbook on physical organic chemistry,[2] and is credited with coining the term.


  1. American Chemical Society - Chicago Section
  2. Hammett, Louis P. (1940) Physical Organic Chemistry New York: McGraw Hill.

Further reading

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