Trapping Nanostructures on Surfaces through Weak Interactions.
The assembly of imidazole-functionalized phenanthroline-strapped zinc porphyrins (ZnPorphen) with alkyl or polyethylene glycol (PEG) side chains was studied in solution and by AFM after casting on highly oriented pyrolytic graphite (HOPG) or mica. The nature of the solvent and its evaporation time influenced the morphology of the objects observed. On HOPG, short rods of about 100 nm were observed after fast evaporation of solutions of the alkyl derivatives in CHCl3 , THF, or pyridine, whereas islands of aligned rows of longer wires were obtained from methylcyclohexane (MCH). Slow evaporation of MCH led to a three-dimensional assembly. The PEG porphyrin assembled into short wires on HOPG or fibers on mica after slow evaporation of solutions in THF. This study shows the role of surface-molecule interactions in the interfacial assembly of ZnPorphen derivatives and contributes to understanding the parameters that control their noncovalent assembly into molecular wires on a surface.
Laboratoire de Chimie des Ligands à Architecture Contrôlée, Institut de Chimie, UMR 7177 CNRS-Université de Strasbourg, 4 rue Blaise Pascal, 67008 Strasbourg (France).
Vivien
V
Rauch
National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 4, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8562 (Japan). y.kikkawa@aist.go.jp.
Yoshihiro
Y
Kikkawa
Laboratoire de Chimie des Ligands à Architecture Contrôlée, Institut de Chimie, UMR 7177 CNRS-Université de Strasbourg, 4 rue Blaise Pascal, 67008 Strasbourg (France).
Matthieu
M
Koepf
Laboratoire d'Innovation en Chimie des Surfaces et Nanosciences, DSM/IRAMIS/NIMBE, CEA-Saclay (France).
Ismail
I
Hijazi
Laboratoire de Chimie des Ligands à Architecture Contrôlée, Institut de Chimie, UMR 7177 CNRS-Université de Strasbourg, 4 rue Blaise Pascal, 67008 Strasbourg (France). jwytko@unistra.fr.
Jennifer A
JA
Wytko
Laboratoire d'Innovation en Chimie des Surfaces et Nanosciences, DSM/IRAMIS/NIMBE, CEA-Saclay (France).
Stéphane
S
Campidelli
Laboratoire de Chimie des Ligands à Architecture Contrôlée, Institut de Chimie, UMR 7177 CNRS-Université de Strasbourg, 4 rue Blaise Pascal, 67008 Strasbourg (France).
Antoine
A
Goujon
National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 4, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8562 (Japan).
Masatoshi
M
Kanesato
Laboratoire de Chimie des Ligands à Architecture Contrôlée, Institut de Chimie, UMR 7177 CNRS-Université de Strasbourg, 4 rue Blaise Pascal, 67008 Strasbourg (France). jweiss@unistra.fr.
Jean
J
Weiss
nanotubes; porphyrinoids; scanning probe microscopy; self-assembly; surface analysis