Absolute orientation of molecules of amphiphilic alcohols in crystalline monolayers at the air-water interface

Ron Edgar, Jung Y. Huang, Ronit Popovitz-Biro, Kristian Kjaer, Wim G. Bouwman, Paul B. Howes, Jens Als-Nielsen, Y. Ron Shen*, Meir Lahav, Leslie Leiserowitz

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

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.

Original languageEnglish
Pages (from-to)6843-6850
Number of pages8
JournalJournal of Physical Chemistry B
Volume104
Issue number29
DOIs
StatePublished - 27 Jul 2000

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