Absorption transition moment directions of the diphenylphosphinyl (2a) and methylsulphonyl (3a) -substtuted in 4-dimethylamino-trans-styrenes were determined in stretched poylvinyl alcohol (PVA) films based on measurements of the absorption anisotropies. It has been found that the long-wave absorption spectrum consists of two bands corresponding to differently directed transition moments. The transition moment of the intensive long-wave 1La band is lies along the long axis of these molecules whereas that of the short-wave 1Lbband is oriented at φ = 38° for 2a and φ= 35° for 3a relative to the transition moment direction of the 1Laband.
|Number of pages||4|
|Journal||Zeitschrift fur Naturforschung - Section A Journal of Physical Sciences|
|State||Published - 1 Mar 1992|