Page 118 - Photoreactive Organic Thin Films

3, PHOTO-ORIENTATION BY PHOTOISOHERIZATION 9 J

orientation, and chromophores' orientation is not thermalized during
cis<->trans isomerization shape change. In photochromic spiropyrans and
diarylethenes, the sign of apparent photo-orientation depends on the photo-
chemical transition band, and the B isomer exhibits perpendicular transitions
in the UV versus the visible transition bands.

It is my pleasure to thank many friends and colleagues for their support and many helpful
discussions. In particular, the work on DR1 was done with J. A. Delaire and M. Dumont at the
University of Orsay, and the work on azobenzene was done with W. Knoll and J. Wood at the
Max-Planck Institute for Polymer Research in Mainz. H. Menzel from Hannover University
provided the azo-polyglutamate polymer. The work on azo-polyurethanes and spiropyrans and
diarylethenes was done at Osaka University, Handai, with D. Yasumatsu, H. Ishitobi, and S.
Kawata, and M. Irie from Kyushu University. I would like to thank the Japan Society for the
Promotion of Science for research support under the Research for the Future Program and to
thank the Max-Planck Society for financial support during my stay at the Max-Planck Institute
for Polymer Research in Mainz.