title: Spectral blue shift via intermolecular interactions in the B2 and B4 phases of a bent-shaped molecule.
abstract: A set of precise measurements of UV-Vis absorption spectrum for the classical bent-shaped molecule, P-12-OPIMB, revealed that molecular exciton interactions exist even in the mesophases of this system, as manifested as an obvious and abrupt change in the positional and spectral shape at phase-transition points. Based on Kasha's molecular exciton model, we successfully conducted a quantitative analysis of the spectral shift and could determine the local structure of the B4 phase. To the best of our knowledge, such a spectroscopic analysis for the liquid crystals has not been connected with the local structure.
authors.affiliation: Department of Organic and Polymeric Materials, Tokyo Institute of Technology, 2-12-1-S8-42 O-okayama, Meguro-ku, Tokyo 152-8552, Japan.
authors.forename: Fumito
authors.initials: F
authors.lastname: Araoka
authors.forename: Taketo
authors.initials: T
authors.lastname: Otani
authors.forename: Ken
authors.initials: K
authors.lastname: Ishikawa
authors.forename: Hideo
authors.initials: H
authors.lastname: Takezoe