TY - JOUR
T1 - Absolute orientation of molecules of amphiphilic alcohols in crystalline monolayers at the air-water interface
AU - Edgar, Ron
AU - Huang, Jung Y.
AU - Popovitz-Biro, Ronit
AU - Kjaer, Kristian
AU - Bouwman, Wim G.
AU - Howes, Paul B.
AU - Als-Nielsen, Jens
AU - Shen, Y. Ron
AU - Lahav, Meir
AU - Leiserowitz, Leslie
PY - 2000/7/27
Y1 - 2000/7/27
N2 - The absolute orientations of the amphiphilic molecules α-hydroxy ω-bromo alcohols BrCnH2n OH, n= 21, 22, and the alkyl hydroxy esters CmH2m+1COO(CH2)nOH, m = 14, 15, n = 10, in crystalline monolayer forms on water have been determined, the former by grazing incidence X-ray diffraction (GIXD) and the latter by sum frequency generation (SFG). The assignment was made for the alkyl hydroxy esters by establishing the polar angle between the terminal CH3-C bond and the normal to the plane of the monolayer; for the bromo alcohols the assignment was made by a determination of the two-dimensional crystal structure via X-ray structure factor calculations. The SFG results are in agreement with reported GIXD and lattice energy analyses of the alkyl hydroxy esters m = 19, n = 9, 10. These studies have further revealed the absolute orientation of the alcohol C-OH bonds at the water surface, which in turn can be correlated with the ice-nucleating behavior of the monolayers on supercooled water drops in terms of the odd and even values of n.
AB - The absolute orientations of the amphiphilic molecules α-hydroxy ω-bromo alcohols BrCnH2n OH, n= 21, 22, and the alkyl hydroxy esters CmH2m+1COO(CH2)nOH, m = 14, 15, n = 10, in crystalline monolayer forms on water have been determined, the former by grazing incidence X-ray diffraction (GIXD) and the latter by sum frequency generation (SFG). The assignment was made for the alkyl hydroxy esters by establishing the polar angle between the terminal CH3-C bond and the normal to the plane of the monolayer; for the bromo alcohols the assignment was made by a determination of the two-dimensional crystal structure via X-ray structure factor calculations. The SFG results are in agreement with reported GIXD and lattice energy analyses of the alkyl hydroxy esters m = 19, n = 9, 10. These studies have further revealed the absolute orientation of the alcohol C-OH bonds at the water surface, which in turn can be correlated with the ice-nucleating behavior of the monolayers on supercooled water drops in terms of the odd and even values of n.
UR - http://www.scopus.com/inward/record.url?scp=0034224062&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:0034224062
SN - 1520-6106
VL - 104
SP - 6843
EP - 6850
JO - Journal of Physical Chemistry B
JF - Journal of Physical Chemistry B
IS - 29
ER -