Highly fluorinated single-chained and/or double-chained phospholipids containing the perfluorooctyl group as the terminal segment of hydrophobic chains and a phosphocholine moiety as the hydrophilic headgroup were synthesized in order to investigate the effect of fluorinated segments on the stability of phospholipid monolayers formed at the air-water interface. Judging from the equilibrium spreading pressures (pi(e)s) Of their monolayers at the air-water interface, all of the fluorinated phospholipids formed more stable monolayers than the corresponding non-fluorinated counterparts. In addition, the fluorinated double-chained phosphatidylcholine containing C-C triple bond (monoyne group) formed stable and fluid vesicle membranes in water, although the single-chained phospholipids did not form vesicle membranes but micellar solutions under the present conditions. (c) 2006 Elsevier B.V. All rights reserved.
Highly fluorinated C18 fatty acids: synthesis and interfacial properties
A fluorinated oleic acid 1-Z containing a perfluorooctyl group and its analogues (E-isomer 1-E, alkyne type 2 and saturated type 3) were synthesized in good yields. In these syntheses, it was found that a key compound 5 could be converted to each of 1-Z, 1-E and 2. Furthermore, equilibrium spreading pressures of their monolayers at the air–water interface were measured in order to demonstrate how the