Ultra-high vacuum scanning tunneling microscopy and theoretical studies of 1-halohexane monolayers on graphite.

ABSTRACT: A simple model system for the 2D self-assembly of functionalized organic molecules on surfaces was examined in a concerted experimental and theoretical effort. Monolayers of 1-halohexanes were formed through vapor deposition onto graphite surfaces in ultrahigh vacuum. Low-temperature scanning tunneling microscopy allowed the molecular conformation, orientation, and monolayer crystallographic parameters to be determined. Essentially identical noncommensurate monolayer structures were found for all 1-halohexanes, with differences in image contrast ascribed mainly to electronic factors. Energy minimizations and molecular dynamics simulations reproduced structural parameters of 1-bromohexane monolayers quantitatively. An analysis of interactions driving the self-assembly process revealed the c

SUBMITTER: Muller T 

PROVIDER: S-EPMC556233 | biostudies-literature | 2005 Apr

REPOSITORIES: biostudies-literature