title: Anisotropy of alkyl chains of azobenzene molecules at the air/water interface observed by sum-frequency vibrational spectroscopy.
abstract: Surface-specific sum-frequency vibrational spectroscopy has been used to study the structure of alkyl chains of azobenzene molecules at the air/water interface. The results show that the alkyl chains are well aligned before UV irradiation and protruding out of the surface with a certain distribution. Although the alkyl chains become less ordered by UV irradiation following dynamical motion due to cis-trans isomerization of the azobenzene core, the alkyl chains show anisotropy in the direction perpendicular to that of the azobenzene core by linearly polarized UV irradiation.
authors.affiliation: Yokoyama Nano-structured Liquid Crystal Project, ERATO, Japan Science & Technology Agency, 5-9-9 Tokodai, Tsukuba, Ibaraki 300-2635 Japan. oh-e@manolc.jst.go.jp
authors.forename: Masahito
authors.initials: M
authors.lastname: Oh-e
authors.forename: Yuka
authors.initials: Y
authors.lastname: Tabe
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Yokoyama