Page 200 - Photoreactive Organic Thin Films

6

PHOTOISOMERIZATION IN

LANGMUm-BLODGETT-KUH
N

STRUCTURES

HENNING MENZEL
Institut fiir Technische Chemie, Technische Universitat, Braunschweig

6.1 INTRODUCTION
6.2 OTHER DYES USED IN PHOTOACTIVE LBK FILMS
6.2.1 Stilbenes
6.2.2 Salicylidene Aniline
6.2.3 Spiropyrans
6.2.4 Other Chromophores
6.3 UV-VIS SPECTROSCOPY AS AN ANALYTICAL TOOL FOR
THE INVESTIGATION OFAZOBENZENE LBK FILM
STRUCTURE
6.3.1 Trans-Cis Interconversion
6.3.2 Aggregation
6.4 EXAMPLES OF THE INFLUENCE OF STRUCTURE ON
PHOTOISOMERIZATION
6.4.1 Mixing with Other Amphiphiles
6.4.2 Adjusting the Structure of the Azobenzene Amphiphile
6.4.3 Coupling of Azobenzene Moities to Polymers
6.5 EXAMPLES OF THE MANIPULATION OF LBK FILM
STRUCTURE BY PHOTOISOMERIZATION
6.5.1 Structure Change
6.5.2 Photoreorientation
6.6 EXAMPLES OF LBK FILMS WITH A STRUCTURE TAILORED
FOR THE DESIRED APPLICATION
6.7 SUMMARY

6.1 INTRODUCTION

Fabrication of photoreactive organic thin films (POTF) requires the use of
special chromophores that change their molecular structure and/or properties
upon irradiation and thereby constitute the basic photoactive function. The
changes in the chromophores' properties should be adequately large to obtain
a satisfactory response toward irradiation. It is not sufficient to have an

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