Siegfried Dähne

from Wikipedia, the free encyclopedia

Siegfried Dähne (born October 13, 1929 in Meißen ; † December 3, 2011 ) was a German chemist and a scientist in the field of dye chemistry .

Life

Dähne studied chemistry from 1949 to 1957 at the Humboldt University in Berlin . As part of his diploma thesis with Otto Neunhoeffer , he dealt synthetically and spectroscopically with investigations on pyrene . In 1961 he was with the thesis " adsorbed visible and infrared spectra of silver halide, photographically useful dyes " doctorate . Also at the Humboldt University in 1968 the habilitation took place . In 1972 Dähne received the license to teach at the Technical University of Dresden and in 1980 was appointed professor by the Academy of Sciences of the GDR .

From 1957 Dähne worked as laboratory manager and from 1963 as department manager at the Institute for Optics and Spectroscopy at the Academy of Sciences. Since he had refused to work as an unofficial employee of the Stasi on several occasions , he was banned from traveling to western countries from 1971 and his managerial functions were withdrawn in 1984. After 1989, Dähne was able to continue his research at the Federal Institute for Materials Research and Testing until 1995 as laboratory manager and finally until 2001 as a consultant.

Siegfried Dähne and his wife Anneliese had a daughter and two sons.

Scientific work

Dähne's research activities focused on the electronic states of organic molecules with π-electron systems . From the polymethine concept published by Walter König in 1926, he developed a general theory of the color and structure of conjugated organic compounds.

His work on sensitizing dyes initiated the development of highly sensitive silver halide films worldwide. Dähne was involved in the development of the world's first pulsed laser fluorimeter based on laser-induced fluorescence . With these newly developed spectroscopic methods, Dähne researched aggregation phenomena of dyes.

Awards

  • 1976: Leibniz Medal from the Academy of Sciences
  • 1997: Lieven Gevaert Medal of the Society of Photographic Scientists and Engineers (USA)

Individual evidence

  1. ^ Siegfried Dähne . In: Vincentz Network (Ed.): Farbe & Lack . No. 11 . Hanover 2004, p. 96 ( Siegfried Dähne's 75th birthday [PDF]).
  2. ^ Dieter Lupold: Siegfried Dähne (1929–2011) . In: News from chemistry . tape 60 , no. 6 , April 2012, p. 678 , doi : 10.1002 / nadc.201290248 .
  3. ↑ Otto Neunhoeffer, Heinz Woggon, Siegfried Dähne: THE ADDITION OF ALKALIMETAL TO PYREN, II . In: Justus Liebig's Annals of Chemistry . tape 612 , no. 1 , March 7, 1958, p. 98 , doi : 10.1002 / jlac.19586120111 .
  4. ↑ 481013180 - Catalog entry in the German National Library
  5. ^ A b F. Dörr: Siegfried Dähne on his 65th birthday . In: Reports of the Bunsen Society for Physical Chemistry . tape 98 , no. 10 , October 1994, p. 1340 , doi : 10.1002 / bbpc.19940981024 .
  6. ↑ W. König: About the term “polymethine dyes” and a general dye formula that can be derived from it as the basis of a new system of color chemistry . In: Journal for Practical Chemistry . tape 112 , no. 1 , January 1926, p. 1 , doi : 10.1002 / prac.19261120101 .
  7. ↑ Siegfried Dähne: Systematics and term expansion of the polymethine dyes . In: Journal of Chemistry . tape 5 , no. December 12 , 1965, p. 441 , doi : 10.1002 / zfch.19650051202 .
  8. ^ Siegfried Dähne, Dieter Leupold: The Polymethinzustand. III. Communication on general relationships between color and structure of organic compounds . In: Reports of the Bunsen Society for Physical Chemistry . tape 70 , no. 6 , August 1966, p. 618 , doi : 10.1002 / bbpc.19660700603 .
  9. ↑ Siegfried Dähne, Siegfried Kulpe: Alternating and non-alternating polymethines - a generalization of previous color rules . In: Journal for Practical Chemistry . tape 320 , no. 3 , 1978, p. 395 , doi : 10.1002 / prac.19783200306 .
  10. ↑ Siegfried Dähne, Siegfried Kulpe, Klaus-Dieter Nolte: Why are organic dyes particularly good spectral sensitizers ?: To commemorate the 100th anniversary of the discovery of spectral sensitization by HW Vogel . In: Journal of Chemistry . tape 13 , no. November 11 , 1973, pp. 422 , doi : 10.1002 / zfch.19730131105 .
  11. ↑ Stefan Kirstein, Siegfried Daehne: J-aggregates of amphiphilic cyanine dyes: Self-organization of artificial light harvesting complexes . In: International Journal of Photoenergy . tape 2006 , 2006, pp. 1 , doi : 10.1155 / IJP / 2006/20363 .
  12. ↑ a b Prof. Dr. habil. Siegfried Dähne . In: Vincentz Network (Ed.): Farbe & Lack . No. 10 . Hanover 2009, p. 1 ( 80th birthday of Siegfried Dähne [PDF]).
personal data
SURNAME Dähne, Siegfried
BRIEF DESCRIPTION German dye chemist
DATE OF BIRTH October 13, 1929
PLACE OF BIRTH Meissen
DATE OF DEATH December 3, 2011