TY - JOUR
T1 - Crystalline self-assembly into monolayers of folded oligomers at the air-water interface
AU - Lederer, K.
AU - Godt, A.
AU - Howes, P.B.
AU - Kjær, K.
AU - Als-Nielsen, J.
AU - Lahav, M.
AU - Wegner, G.
AU - Leiserowitz, L.
AU - Weissbuch, I.
PY - 2000
Y1 - 2000
N2 - Insertion of the 115-bis(ethynylene)benzene unit as a rigid spacer into a linear alkyl chain, thus separating the two resulting stems by 9 Angstrom, induces chain folding at the air-water interface. These folded molecules self-assemble into crystalline monolayers at this interface, with the plane of the folding unit almost perpendicular to the water surface, as determined by synchrotron grazing-incidence X-ray diffraction. Three distinct molecular shapes, of the types U, inverted U, and M, were obtained in the two-dimensional crystalline state, depending upon the number of spacer units, and the number and position of the hydrophilic groups in the molecule. The molecules form ribbons with a higher crystal coherence in the direction of stacking between the molecular ribbons, and a lower coherence along the ribbon direction. A similar molecule, but with a spacer unit that imposes a 5 Angstrom separation between alkyl chains, yields the conventional herringbone arrangement.
AB - Insertion of the 115-bis(ethynylene)benzene unit as a rigid spacer into a linear alkyl chain, thus separating the two resulting stems by 9 Angstrom, induces chain folding at the air-water interface. These folded molecules self-assemble into crystalline monolayers at this interface, with the plane of the folding unit almost perpendicular to the water surface, as determined by synchrotron grazing-incidence X-ray diffraction. Three distinct molecular shapes, of the types U, inverted U, and M, were obtained in the two-dimensional crystalline state, depending upon the number of spacer units, and the number and position of the hydrophilic groups in the molecule. The molecules form ribbons with a higher crystal coherence in the direction of stacking between the molecular ribbons, and a lower coherence along the ribbon direction. A similar molecule, but with a spacer unit that imposes a 5 Angstrom separation between alkyl chains, yields the conventional herringbone arrangement.
KW - Nye funktionelle materialer
U2 - 10.1002/1521-3765(20000616)6:12<2173::AID-CHEM2173>3.0.CO;2-E
DO - 10.1002/1521-3765(20000616)6:12<2173::AID-CHEM2173>3.0.CO;2-E
M3 - Journal article
VL - 6
SP - 2173
EP - 2183
JO - Chemistry: A European Journal
JF - Chemistry: A European Journal
SN - 0947-6539
IS - 12
ER -