Eilhard Mitscherlich

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Eilhard Mitscherlich
Mitscherlich's law
Mitscherlichite
Azobenzene
Goniometer
Selenic acid
AwardsPour le Mérite for Sciences and Arts (1842)
Royal Medal (1829)
ForMemRS (1828)
Scientific career
FieldsChemist
InstitutionsUniversity of Berlin
Doctoral advisorFriedrich Stromeyer
Doctoral studentsHeinrich Gustav Magnus

Eilhard Mitscherlich (German pronunciation: [ˈaɪ̯lhaʁt ˈmɪtʃɐlɪç];[1][2] 7 January 1794 – 28 August 1863) was a German chemist, who is perhaps best remembered today for his discovery of the phenomenon of crystallographic isomorphism in 1819.

Early life and work

Mitscherlich was born at Neuende (now a part of

Persia.[3]

The abdication of

Napoleon Bonaparte in 1814 put an end to this, and Mitscherlich resolved to study medicine in order that he might enjoy that freedom of travel usually allowed in the East to physicians. He began at Göttingen with the study of chemistry, and this so arrested his attention that he gave up his idea of traveling to Persia. From his days in Göttingen dates the treatise on certain parts of Eurasian history, compiled from manuscripts found in the university library and published in Persian and Latin in 1814, under the title Mirchondi historia Thaheridarum historicis nostris hucusque incognitorum Persiae principum.[3]

In 1818 Mitscherlich went to

Karolinska Institutet in Stockholm. Mitscherlich returned to Berlin in 1821, and in the summer of 1822 he delivered his first lecture as extraordinary professor of chemistry at the university; in 1825 he was appointed ordinary professor.[3] In 1823 Mitscherlich was elected as foreign member of the Royal Swedish Academy of Sciences
.

Isomorphism

Bronze statue of Mitscherlich at the Humboldt University of Berlin

In the course of investigating the slight differences discovered by

allotropic crystals, he observed a similar variation, and was thus led, in 1825, to the discovery that allotropic crystals, when heated, expand unequally in the direction of dissimilar axes. In the following year he discovered the change, produced by change of temperature, in the direction of the optic axes of selenite.[3] His investigation, also in 1826, of the two crystalline modifications of sulfur threw much light on the fact that the two minerals calcite and aragonite have the same composition but different crystalline forms, a property which Mitscherlich called polymorphism.[5][6]

Later work and last years

Museum für Naturkunde
in Berlin

In 1833 Mitscherlich made a series of careful determinations of the vapor densities of a large number of volatile substances, confirming the law of

sulphates, while a few years later he proved that the same thing is true of the manganates and the sulfates, and of the permanganates and the perchlorates. He investigated the relation of benzene to benzoic acid and to other derivatives.[10] As related by Gustav Rose[11] Mitscherlich turned away from inorganic chemistry (crystallography) and devoted his attention to organic chemistry, starting out with an investigation of fuel and oil.[12] Mitscherlich kept working on problems of organic chemistry until 1845. His interest in mineralogy led him to study the geology of volcanic regions, and he made frequent visits to the Eifel in an attempt to develop a theory on the cause of volcanism. He did not, however, publish any papers on the subject, though after his death his notes were arranged and published by J. L. A. Roth in the Memoirs of the Berlin Academy[10] (Ueber die vulkanischen Erscheinungen in der Eifel und über die Metamorphie der Gesteine durch erhöhte Temperatur, Berlin, 1865).[13]

Mitscherlich was an honorary member of almost all the great scientific societies, and received the gold medal from the

French Institute.[13] In 1855, Mitscherlichwas elected a Foreign Honorary Member of the American Academy of Arts and Sciences.[15]

Mitscherlich's mausoleum at the Alter St.-Matthäus-Kirchhof in Berlin

In December 1861, symptoms of

heart disease made their appearance, but Mitscherlich was able to carry on his academic work until December 1862. He died at Schöneberg near Berlin in 1863 and was buried in the St Matthäus Kirchhof Cemetery in Schöneberg close to the (eventual) gravesites of Gustav Kirchhoff and Leopold Kronecker
.

Papers

Mitscherlich published, according to the "Catalogue of Scientific Papers", some 76 papers, which appeared chiefly in the "Abhandlungen der Königlichen Akademie der Wissenschaften in Berlin", in

Annalen, and in the Annales de chimie et de physique. In 1829 the first installment of the first volume of Mitscherlich's Lehrbuch der Chemie appeared. Not until 1840 the second installment of the second part of this monumental text book was printed.[16] The fourth edition of Mitscherlich's Lehrbuch der Chemie was published in 1844–1847; a fifth was begun in 1855, but was never completed.[10] A complete edition of his works was published in Berlin in 1896.[14]

Notes

  1. ISBN 978-3-411-04067-4
    .
  2. ISBN 978-3-11-018202-6
    .
  3. ^ a b c d Chisholm 1911, p. 627.
  4. ^ Mitscherlich, E. (1819): Ueber die Kristallisation der Salze in denen das Metall der Basis mit zwei Proportionen Sauerstoff verbunden ist. Abhandlungen der Akademie der Wissenschaften zu Berlin, Jg.1818–1819, pp.427–437. [1]
  5. doi:10.1021/ed046p580
    .
  6. ^ (Anonymous) (1864). "Eilhard Mitscherlich (Obituary)". Proceedings of the Royal Society of London. 13: ix–xvi.
  7. ^ Chisholm 1911, pp. 627–628.
  8. ^ E. Mitscherlich (1834) "Ueber die Aetherbildung" (On the formation of ether), Annalen der Physik und Chemie, 31 (18) : 273–282.
  9. ^ J. J. Berzelius, Årsberättelsen om framsteg i fysik och kemi [Annual report on progress in physics and chemistry], (Stockholm, Sweden: Royal Swedish Academy of Sciences, 1835). After reviewing Eilhard Mitscherlich's research on the formation of ether, Berzelius coined the word katalys (catalysis) on page 245:

    Original: Jag skall derföre, för att begagna en i kemien välkänd härledning, kalla den kroppars katalytiska kraft, sönderdelning genom denna kraft katalys, likasom vi med ordet analys beteckna åtskiljandet af kroppars beståndsdelar medelst den vanliga kemiska frändskapen.

    Translation: I shall, therefore, to employ a well-known derivation in chemistry, call [the catalytic] bodies [i.e., substances] the catalytic force and the decomposition of [other] bodies by this force catalysis, just as we signify by the word analysis the separation of the constituents of bodies by the usual chemical affinities.
  10. ^ a b c Chisholm 1911, p. 628.
  11. ^ Rose, G. (1864): Zur Erinnerung an E. Mitscherlich. Zeitschrift der Deutschen Geologischen Gesellschaft, vol. 16, pp. 21–72. [2]
  12. ^ Mitscherlich, E. (1833): Ueber das Benzin und die Säuren der Oel- und Talgarten. Annalen der Physik (Poggendorff), vol. 105 (=Ser. 2, vol. 29), pp. 231–237. [3]
  13. ^
    The American Cyclopædia
    .
  14. ^
    New International Encyclopedia
    (1st ed.). New York: Dodd, Mead.
  15. ^ "Book of Members, 1780–2010: Chapter M" (PDF). American Academy of Arts and Sciences. Retrieved 15 September 2016.
  16. ^ Mitscherlich, E.: Lehrbuch der Chemie. Ernst Siegfried Mittler, Berlin. Band 1, Abth.1 (1829) = 194 p.; Band 1, Abth.2 (1832) = 532 p.; Band 2, Abth.1 (1835) = 216 p.; Band 2, Abth.2 (1840) = 500 p.

Further reading

  • Eilhard Mitscherlich: Prince of Prussian Chemistry by Hans-Werner Scuhtt, 1997,
    ISBN 0-8412-3345-4
  • Obituary of Eilhard Mitscherlich in Proceedings of the Royal Society of London, volume XIII, 1864 (pages ix – xvi, near the end of the volume)

See also

References

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