Hermann Staudinger
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| Hermann Staudinger | |
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| Born | March 23, 1881 Worms, Grand Duchy of Hesse, German Empire |
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| Died | September 8, 1965 (aged 84) Freiburg, Germany |
| Nationality | Germany |
| Fields | Chemistry |
| Institutions | University of Strasbourg University of Karlsruhe ETH Zürich University of Freiburg |
| Alma mater | University of Halle |
| Doctoral advisor | Daniel Vorländer |
| Doctoral students | Lavoslav Ružička |
| Known for | Polymer chemistry |
| Notable awards |  Nobel Prize in Chemistry |
Hermann Staudinger (March 23, 1881 – September 8, 1965) was a German chemist who demonstrated the existence of macromolecules which he characterized as polymers. For this work he received the 1953 Nobel Prize in Chemistry. He is also known for his discovery of ketenes and of the Staudinger reaction.
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[edit] Early work
Hermann Staudinger was born in 1881 in Worms, Germany. After receiving his Ph.D. from the University of Halle in 1903, Staudinger took a position at the University of Strasbourg.
It was here that he discovered the ketenes, a family of molecules characterized by the general form depicted in Figure 1.[1] Ketenes would prove a synthetically-important intermediate for the production of yet-to-be-discovered antibiotics such as penicillin and amoxicillin.
In 1907, Staudinger began an assistant professorship at the Technical University of Karlsruhe where he successfully isolated a number of useful organic compounds (including a synthetic coffee flavoring) as more completely reviewed by Mülhaupt.[2]
[edit] The Staudinger reaction
In 1912, Staudinger took on a new position at the Swiss Federal Institute of Technology in Zurich, Switzerland. One of his earliest discoveries came in 1919, when he and colleague Meyer reported that azides react with triphenylphosphine to form phosphazide (Figure 2).[3] This reaction – commonly referred to as the Staudinger reaction – produces a high phosphazide yield.[4]
[edit] Polymer chemistry
While at Karlsruhe and later, Zurich, Staudinger began research in the chemistry of rubber, for which very high molecular weights had been measured by the physical methods of Raoult and van 't Hoff. Contrary to prevailing ideas (see below), Staudinger proposed in a landmark paper published in 1920 that rubber and other polymeric substances such as starch, cellulose and proteins are long chains of short repeating molecular units linked by covalent bonds.[5] In other words, polymers are like chains of paper clips, made up of small constituent parts linked from end to end (Figure 3).
At the time leading organic chemists such as Emil Fischer and Heinrich Wieland.[2][6] believed that the measured high molecular weights were only apparent values caused by the aggregation of small molecules into colloids. At first the majority of Staudinger’s colleagues refused to accept the possibility that small molecules could link together covalently to form high-molecular weight compounds. As Mülhaupt aptly notes, this is due in part to the fact that molecular structure and bonding theory were not fully understood in the early 20th century.[2]
Further evidence to support Staudinger’s hypothesis emerged in the 1930s. High molecular weights of polymers were confirmed by membrane osmometry, and also by Staudinger’s measurements of viscosity in solution. The X-ray diffraction studies of polymers by Herman Mark provided direct evidence for long chains of repeating molecular units. And the synthetic work led by Carothers demonstrated that polymers such as nylon and polyester could be prepared by well-understood organic reactions.
[edit] Legacy
Staudinger’s groundbreaking elucidation of the nature of the high-molecular weight compounds he termed Makromoleküle paved the way for the birth of the field of polymer chemistry.[7] Staudinger himself saw the potential for this science long before it was fully realized. “It is not improbable,” Staudinger smartly commented in 1936, “that sooner or later a way will be discovered to prepare artificial fibers from synthetic high-molecular products, because the strength and elasticity of natural fibers depend exclusively on their macro-molecular structure – i.e., on their long thread-shaped molecules.”[8] Staudinger founded the first polymer chemistry journal in 1940,[9] and in 1953 received the Nobel Prize in Chemistry for “his discoveries in the field of macromolecular chemistry.”[10] His pioneering research has afforded the world myriad plastics, textiles, and other polymeric materials which make consumer products more affordable, attractive, and fun.
[edit] See also
[edit] References
- ^ Hermann Staudinger (1905). "Ketene, eine neue Körperklasse". Berichte der deutschen chemischen Gesellschaft 38 (2): 1735-1739. doi:.
- ^ a b c Mülhaupt, R. (2004). "Hermann Staudinger and the Origin of Macromolecular Chemistry". Angew. Chem. Int. Ed. 43: 1054-1063. doi:.
- ^ Staudinger, H.; Meyer, J. (1919). "Über neue organische Phosphorverbindungen III. Phosphinmethylenderivate und Phosphinimine". Helv. Chim. Acta 43: 635-646. doi:.
- ^ Breinbauer, R.; Kohn, M. (2004). "The Staudinger Ligation - A Gift to Chemical Biology". Angew. Chem. Int. Ed. 43: 3106-3116. doi:.
- ^ Staudinger, H. Ber. Deut. Chem. Ges. 1920, 53, 1073.
- ^ Feldman, S. D.; Tauber, A. I. Bulletin of the History of Medicine 1997, 17(4), 623-650.
- ^ Staudinger, H. Trans. Faraday Soc. 1933, 29, 18-32.
- ^ Staudinger, H. Trans. Faraday Soc. 1936, 32, 323-335.
- ^ Meisel, I.; Mülhaupt, R. Macromol. Chem. Phys. 2003, 204, 195-206.
- ^ The Nobel Prize in Chemistry 1953 (accessed Mar 2006).
- Helmut Ringsdorf (2004). "Hermann Staudinger and the Future of Polymer Research Jubilees - Beloved Occasions for Cultural Piety". Angewandte Chemie International Edition 43 (9): 1064-1076. doi:.
- Heinrich Hopff (1969). "Hermann Staudinger 1881-1965". Chemische Berichte 102 (5): XLI. doi:.
[edit] External links
- Staudinger's Nobel Foundation biography
- Staudinger's Nobel Lecture Macromolecular Chemistry
- Staudinger’s life and career.
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