Conformation, orientation and interaction in molecular monolayers: A surface second harmonic and sum frequency generation study
Abstract
Sum frequency generation (SFG) was used to study the order in a silane monolayer before and after the deposition of a coadsorbed liquid crystal monolayer. An increase was observed in the order of the chain of the silane molecule induced by the interpenetration of the liquid crystal molecules. By using second harmonic generation (SHG) and SFG, the orientation and conformation of the liquid crystal molecule on clean and silane coated glass surfaces was studied. On both surfaces, the biphenyl group is tilted by 70 deg with the alkyl chain end pointing away from the surface. The shift in the C-H stretch frequencies in the coadsorbed system indicates a significant interaction between molecules.
- Publication:
-
Presented at NICOLS '89: 9th International Conference on Laser Spectroscopy
- Pub Date:
- December 1988
- Bibcode:
- 1988lasp.conf...18S
- Keywords:
-
- Crystal Structure;
- Harmonic Generations;
- Liquid Crystals;
- Resonant Frequencies;
- Vibrational Spectra;
- Adsorption;
- Silanes;
- Surface Properties;
- Solid-State Physics