The behavior of several species of discogenic molecules at the air-water
interface has been determined by measuring surface pressure vs. molecular
area isotherms. Alkylthiotriphenylene derivatives do not appear to
form monolayers at the interfaces, due to lack of amphiphilic character.
Two truxene derivatives were found to display molecular areas on
the order of 65 angstrom 2, most likely due to the molecules lying
<< edge-on >> to the water surface. Hexacyclens generally lie with
the core group parallel to the surface of the water with the tail
groups extending away from the interface ; a higher density phase
may correspond to conformational changes within the molecule.
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