title: Synthesis and adsorption of shape-persistent macrocycles containing polycyclic aromatic hydrocarbons in the rigid framework.
abstract: Shape-persistent macrocycles with interiors in the nanometer regime were prepared by the oxidative cyclization of the appropriate bisacetylene precursors under high-dilution conditions. These compounds contain polycyclic aromatic hydrocarbons in the ring backbone and are decorated with extra annular oligoalkyl or silyl side groups. Interestingly, after depositing them on different surfaces and investigating the self-assembled structures by means of scanning tunneling microscopy (STM) and atomic force microscopy (AFM), various nanostructures were observed. STM showed that these macrocycles are organized in two-dimensional (2D) layers, whereas AFM showed, in addition, the formation of 2D crystallites and one-dimensional fibrils. These results reveal the importance of the extra annular substitution of the macrocycles in creating patterned surfaces and nanoscale objects.
authors.affiliation: Institut für Technische Chemie und Polymerchemie, Engesserstrasse 18, 76131 Karlsruhe, Germany.
authors.forename: Xiaohong
authors.initials: X
authors.lastname: Cheng
authors.forename: An
authors.initials: A
authors.lastname: Ver Heyen
authors.forename: Wael
authors.initials: W
authors.lastname: Mamdouh
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Uji-i
authors.forename: Frans
authors.initials: F
authors.lastname: De Schryver
authors.forename: Sigurd
authors.initials: S
authors.lastname: Höger
authors.forename: Steven
authors.initials: S
authors.lastname: De Feyter