EFFECTS OF HIGH PRESSURES ON THE ABSORPTION SPECTRUM OF AZOBENZENE.
CALIFORNIA UNIV SANTA BARBARA DEPT OF CHEMISTRY
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The effects of high pressures 0-25 kbar on the near ultraviolet and visible absorption spectra of trans-azobenzene were studied. Azobenzene was dispersed in six different polymer matrices and compressed in an optical cell at room temperature. The magnitude and direction of the spectral shift depend upon the type of transition n-pi vs. pi-pi, the nature of the polymer matrix, and other specific interactions whose relative importance are not easily ascertained. The n-pi band showed a blue shift in a hydroxylic polymer at the highest pressure. The intensity of the pi-pi band was unaffected by compression while the n-pi band strength increased significantly. Such enhancement could result from partial removal of its symmetry-forbiddenness or greater intensity stealing from the pi-pi transition at higher pressures. Author
- Polymer Chemistry
- Atomic and Molecular Physics and Spectroscopy