We have used second harmonic generation to directly observe chemical changes in a lipid monolayer. We observed that pK, of phexadecyl aniline at the air/water interface is 3.6& 0.2 versus 5.3 fO.l in the bulk. This fiftyfold increase in acidity is due to the higher free energy of a charged species a
Second-harmonic generation in monolayers of hemicyanine dyes at the air/water interface: Observation of chemical degradation
β Scribed by G. Gillberg; R. Keosian; J. L. Pruksarnukul; D. W. Lupo
- Publisher
- Springer
- Year
- 1991
- Weight
- 843 KB
- Volume
- 1
- Category
- Article
- ISSN
- 0925-5125
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π SIMILAR VOLUMES
The second harmonic generation from charged monolayers at air/water interfaces is shown to be linearly related to the interface electric potential. This dependence is due to the polarization of water molecules in the electrostatic field of the charged monolayer. The observed linear dependence of the
Equilibrium surface tension (sigma(e)) versus concentration isotherms of surface-chemically pure aqueous solutions of the homologous series of N-n-alkyl-4'-(dimethylamino)-stilbazium bromides ("hemicyanines") were measured at 295 K. The adsorption parameters of saturation adsorption and standard fre
Monolayers of two nitroaniline-terminated amphiphilic compounds that differ from each other only by a methylene group in the hydrocarbon chain arestudied at the air-water interface by optical second harmonic generation and ellipsometry. The nitroanilino groups exhibit significantly different orderin