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Self‐Assembly of Alkoxy‐Substituted Bis(hydrazone)‐Based Organic Ligands and of a Metallosupramolecular Grid on Graphite
Author(s) -
Pace Giuseppina,
Stefankiewicz Artur,
Harrowfield Jack,
Lehn JeanMarie,
Samorì Paolo
Publication year - 2009
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.200800733
Subject(s) - scanning tunneling microscope , hydrazone , alkoxy group , graphite , crystallography , self assembly , cationic polymerization , materials science , chemistry , ligand (biochemistry) , nanotechnology , stereochemistry , polymer chemistry , alkyl , organic chemistry , biochemistry , receptor
On edge : Self‐assembled monolayers of a bis(hydrazone)‐based molecular grid physisorbed on graphite are studied by scanning tunneling microscopy (see picture). High order is attained at the supramolecular level by thermal annealing of the grid‐based films. A preferential edge‐on configuration of the molecular grid with respect to the substrate is found.Self‐assembly of a bis(hydrazone) chelating ligand functionalized with octadecyloxy substituents is described, as well as the reproducible thermally activated self‐assembly of its metallosupramolecular cationic Co II [2×2] grid‐type complex, on a highly oriented pyrolitic graphite (HOPG) substrate. Scanning tunnelling microscopy measurements at the solid/liquid interface reveal that the grid units of the annealed films are oriented edge‐on to the basal plane of the HOPG, which indicates that the influence of the octadecyl chains is not sufficient to tie the grids into a face‐on orientation. To gain a detailed understanding of the self‐assembly behaviour of the grid on HOPG, the results for the grid itself have been compared to those of its constituent ligands.