Two-Dimensional Chiral Self-Assembly of Barbituric-Acid-Functionalized Naphthelene Derivatives
Résumé
Scanning tunneling microscopy is used to investigate the self-assembly of two barbiturate-functionalized naphthalene derivatives on a graphite surface at the nanometer scale. The backbone of the molecules has one or two naphthalene units. The two molecules adopt a head-to-head arrangement, stabilized by double hydrogen-bonds between molecules and barbituric acid unit. The variation of molecular backbone design appears to govern the number of molecular side-by-side neigbours. The shortest compound is thus forming a chiral lamellar structure, whereas the longest compound is forming a chiral row structure on the graphite surface.