LANGMUIR-BLODGETT-FILMS OF TRIAZOLEHEMIPORPHYRAZINES - EVIDENCE FOR MOLECULAR-ORGANIZATION

Triazolehemiporphyrazine derivatives bearing crown ether macrocycles h ave been investigated in Langmuir and Langmuir-Blodgett films. Using i nfrared dichroism and ESR experiments and after careful assignments of infrared bands, the organization of these molecules within the LB mul tilayer has been characterized. These compounds form stacks of macrocy cles and are tilted with respect to the normal of the substrate. These aggregates of about 50 molecules are partially oriented in the plane of the layers, showing that some ordering occurs during the transfer o f the monolayer onto a solid substrate. This so-called stack-of-cards configuration is a first step to organize the crown ether groups in or der to form channels in LB films.