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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 39, Iss. 1 — Jan. 1, 1949
  • pp: 49–55

Orientation of Methylene Blue Molecules Adsorbed on Solids

SCOTT ANDERSON  »View Author Affiliations

JOSA, Vol. 39, Issue 1, pp. 49-55 (1949)

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The author has investigated the state of orientation of methylene blue molecules absorbed on rubbed glasses. Reflection spectra made with polarized visible radiation demonstrate conclusively that the long axis of the molecules is perpendicular to the direction in which the glass was originally rubbed. Absorption spectra with polarized infra-red radiation show, in addition, that the molecules are adsorbed on the glass with the plane of their benzene ring parallel to the glass.

SCOTT ANDERSON, "Orientation of Methylene Blue Molecules Adsorbed on Solids," J. Opt. Soc. Am. 39, 49-55 (1949)

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  1. H. Zocher, Naturwiss. 13, 1015 (1925).
  2. Lucien Demon, Ann. de physique 1, 101 (1946); S. E. Sheppard, R. H. Lambert, and R. D. Walker, J. Chem. Phys. 7, 265 (1939); H. Zocher and K. Coper, Zeits. f. physik. Chemie 132, 295 (1928).
  3. W. H. Taylor, Zeits. f. Krist. 01, 450 (1935).
  4. Eugene Rabinovitch and Leo F. Epstein, J. Am. Chem. Soc. 63, 69 (1941).
  5. L. Michaelis and S. Granick, J. Am. Chem. Soc. 67, 1212 (1945).
  6. C. Schaefer, Zeits. f. Physik 75, 687 (1932).
  7. G. N. Lewis and M. Calvin, Chem. Rev. 25, 273 (1939).
  8. A. H. Pfund, J. Opt. Soc. Am. 37, 558 (1947).
  9. Hydrogen out-of-plane vibrations in benzene are less than 1000 cm-1. In particular, there is a degenerate vibration (10a, b) at 951 cm-1 in benzene and this may have degeneracy splitting. See F. A. Miller and B. L. Crawford, J. Chem. Phys. 14, 282 (1946).
  10. See for example, George Herzberg, Infrared and Raman Spectra (D. Van Nostrand Company, Inc., New York, 1945), pp. 338 and 360–361.
  11. This is a vibration designated by 8A, B by Kenneth S. Pitzer and Donald W. Scott, J. Am. Chem. Soc. 65, 803 (esp. p. 815) (1943).

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