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The Photoisomerization of Azobenzene at 77°K in a Rigid Solvent and at Room Temperature


Kraus, Bernhard August (1958) The Photoisomerization of Azobenzene at 77°K in a Rigid Solvent and at Room Temperature. Master's thesis, California Institute of Technology. doi:10.7907/RDAG-4773.


The photoisomerization of azobenzene has been studied at room temperature in ethanol and P. Me.H., and at 77°K in a P.Me.H. rigid solvent. At room temperature, the photostationary state composition is 74% trans (and 26 % cis) in ethanol and 77 % trans in P.Me.H.; it is 98 % trans in P.Me.H. at 77°K. It has been shown that both the trans to cis and the cis to trans photoisomerizations occur in the rigid solvent at liquid nitrogen temperature. The spectra and molar extinction coefficients have been determined at room temperature for trans azobenzene in ethanol and P.Me.H. Other spectra were taken of azobenzene: at the photostationary state, at room temperature in ethanol and P.Me.H., and at 77°K in P.Me.H.; at 77°K of 100 % and 77 % trans in P.Me.H. It has been shown that the photoisomerization occurs more readily by irradiation in the visible, than in the ultraviolet region. A new low temperature cell has been designed and used.

Item Type:Thesis (Master's thesis)
Subject Keywords:(Chemistry)
Degree Grantor:California Institute of Technology
Division:Chemistry and Chemical Engineering
Major Option:Chemistry
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Davidson, Norman R.
Thesis Committee:
  • Unknown, Unknown
Defense Date:1 January 1958
Record Number:CaltechTHESIS:05032010-130844301
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:5765
Deposited By: Tony Diaz
Deposited On:16 Jul 2010 16:39
Last Modified:16 Oct 2023 21:57

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