DOI: 10.1051/jp2:1992114
J. Phys. II France 2 (1992) 75-85

Self-organization of discogenic molecules at the air-water interface

Nicholas C. Maliszewskyj¹, Paul A. Heiney¹, J. Kent Blasie², John P. McCauley Jr.² and Amos B. Smith III<sup>2

1</sup>  Department of Physics and Laboratory for Research on the Structure of Matter, University of Pennsylvania, Philadelphia, PA 19104, U.S.A.
²  Department of Chemistry and Laboratory of Research on the Structure of Matter, University of Pennsylvania, Philadelphia, PA 19104, U.S.A.

(Received 11 September 1991, accepted 27 September 1991)

Abstract
The behavior of several species of discogenic molecules at the air-water interface has been determined by measuring surface pressure , 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 Å 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 coorespond to conformational changes within the molecule.

PACS
68.10.G-82.65.D-61.30

© Les Editions de Physique 1992