Final published version
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
}
TY - JOUR
T1 - High fidelity self-recognition of isomeric oligopyridines in binary 2D self-assembly and its application for separation
AU - Caterbow, Daniel
AU - Roos, Matthias
AU - Hoster, Harry E.
AU - Behm, R. Jürgen
AU - Landfester, Katharina
AU - Ziener, Ulrich
PY - 2011/7/4
Y1 - 2011/7/4
N2 - Self-assembly in two binary mixtures based on three isomeric oligopyridines at the liquid/HOPG (highly oriented pyrolytic graphite) interface is presented. Despite their structural similarity the molecules display exclusive phase separation, which is attributed to the highly specific intermolecular hydrogen bonding interactions. Variation of the mole fractions in solution reveal strongly preferred adsorption of the major compound, which underlines the importance of self-recognition for self-assembly. Those findings at the molecular level can be applied to separation issues on a macroscopic scale, leading to a completely new concept of separation, which could have a strong impact on various chromatographic processes. Binary SAMs put to work: Binary mixtures of structurally closely related isomeric oligopyridine molecules show exclusive phase separation in two-dimensional self-assembly at the solid/liquid interface (see figure). The presence of only a slight imbalance of the oligopyridines in the supernatant causes the adsorption of only one isomer, in a process driven by the energy penalty of the hetero phase boundaries. Such S-shape behaviour can be exploited for separation purposes.
AB - Self-assembly in two binary mixtures based on three isomeric oligopyridines at the liquid/HOPG (highly oriented pyrolytic graphite) interface is presented. Despite their structural similarity the molecules display exclusive phase separation, which is attributed to the highly specific intermolecular hydrogen bonding interactions. Variation of the mole fractions in solution reveal strongly preferred adsorption of the major compound, which underlines the importance of self-recognition for self-assembly. Those findings at the molecular level can be applied to separation issues on a macroscopic scale, leading to a completely new concept of separation, which could have a strong impact on various chromatographic processes. Binary SAMs put to work: Binary mixtures of structurally closely related isomeric oligopyridine molecules show exclusive phase separation in two-dimensional self-assembly at the solid/liquid interface (see figure). The presence of only a slight imbalance of the oligopyridines in the supernatant causes the adsorption of only one isomer, in a process driven by the energy penalty of the hetero phase boundaries. Such S-shape behaviour can be exploited for separation purposes.
KW - adsorption
KW - binary mixtures
KW - oligopyridines
KW - scanning probe microscopy
KW - self-assembly
U2 - 10.1002/chem.201003319
DO - 10.1002/chem.201003319
M3 - Journal article
AN - SCOPUS:79959628052
VL - 17
SP - 7831
EP - 7836
JO - Chemistry - A European Journal
JF - Chemistry - A European Journal
SN - 0947-6539
IS - 28
ER -