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Supramolecular Control of Two‐Dimensional Phase Behavior
Author(s) -
De Feyter Steven,
Larsson Mattias,
Schuurmans Norbert,
Verkuijl Bas,
Zoriniants George,
Gesquière André,
AbdelMottaleb Mohamed M.,
van Esch Jan,
Feringa Ben L.,
van Stam Jan,
De Schryver Frans
Publication year - 2003
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200390137
Subject(s) - alkyl , hydrogen bond , molecule , crystallography , urea , phase (matter) , monolayer , supramolecular chemistry , scanning tunneling microscope , chemistry , derivative (finance) , self assembly , materials science , stereochemistry , nanotechnology , organic chemistry , financial economics , economics
We have used directed two‐component self‐assembly to “pattern” organic monolayers on the nanometer scale at the liquid/solid interface. The ability of the scanning tunneling microscope to investigate structural details in these adlayers was used to gain insight into the two‐component two‐dimensional phase behavior. The components are symmetrically alkylated bisurea derivatives (R1‐urea‐spacer‐urea‐R2; R1, R2=alkyl, spacer=alkyl or bisthiophene). The bisthiophene unit acts as a marker and its bisurea derivative ( T2 ) is a component in all the mixtures investigated. By varying the position of the hydrogen‐bond forming urea groups along the molecule and the length of the alkyl chains of the other components, the effect of 1) hydrogen bonding, 2) molecule length, 3) odd–even effects, and 4) shape complementarity on the two‐dimensional phase behavior was investigated. Insight into the effect of these parameters leads to the control of the two‐dimensional patterning: from randomly intermixed systems to phase separation.